George Douglas McFly was the father of Dave, Linda and Marty McFly, and the husband of Lorraine Baines McFly. He was of Irish-American ancestry.
George McFly was born on April 1, 1938 in Hill Valley, California. He was the only child of Arthur and Sylvia McFly, living on Sycamore Street, and by 1985 was married to Lorraine with whom he has three kids, Dave, Linda and Marty.
George was an insecure kid who grew up to become a nerdy wimp who was unable to stand up for himself. He had few friends at high school and probably did not have that many afterwards. In the original timeline, George worked at an unidentified company where his supervisor was his old school bully Biff Tannen, whereas in the new timeline he wrote sci-fi stories (in both timelines, he`d been writing the stories since high school). George liked watching sci-fi programs and old shows such as The Honeymooners and Science Fiction Theatre. He was not very "sporty" but did like playing tennis with his wife, and playing golf. His favorite beverage in 1955 was chocolate milk. The novel says that in 1955, George was very superstitious. He was a very cautious person, and not one to rush into things. He also had a distinctive laugh.
When he was 12, he nearly stood up for a friend, Billy Stockhausen, who was being bullied, but did not, and has hated himself for it ever since. In 1954, he tried reading How to Win Friends and Influence People, but the advice he gained from this book made people stay away from him even more. 
George was probably bullied from a very early age, not just by Biff but by other classmates such as Mark Dixon. He had been attracted to Lorraine for some time by 1955 (they may have met for the first time upon entering high school) but was too scared to ask her out.
George, aged 17, in 1955, attempting to ask out Lorraine.In the original timeline, George and Lorraine fell in love when Lorraine`s father Sam knocked George over in his car due to George falling out of a tree into the road (he had been "birdwatching", watching Lorraine get undressed from the tree). The Baines family took George into the house and Lorraine felt sorry for him. In a "Florence Nightingale" effect, she fell in love with him and they had their first date a week later, at the Enchantment Under the Sea dance.
George and Lorraine were married by 1963 when their first child Dave was born. Linda followed in 1966 and Marty in 1968. Despite these changes, George stayed much the same as he was when he was 17. He was dominated by his now supervisor Biff, most of his colleagues, and even his neighbors, and even kept the same hairstyle for 30 years. George did not develop the courage to stand up for himself or even for his wife, which depressed her so much that she became an alcoholic, a smoker and overweight. The story of George`s life would be rewritten when Marty traveled back into the past.
the morning of Saturday, November 5, 1955, 17 year old George McFly was eating cereal at Lou`s Cafe when Biff Tannen and his gang walked into the restaurant. George, who was regularly bullied by Biff, had escaped worse treatment by doing Biff`s homework for him. On that day, however, George hadn`t done the work quickly enough, and Biff had singled him out. After the gang left, George noticed that he was being stared at by a teenager sitting next to him. Before George could find out what the stranger wanted, one of Lou`s employees, Goldie, nagged George about not standing up to Biff. George rode away on his bike.
Later that morning, George was getting a thrill by climbing up into a tree across the street from Lorraine Baines, and spying on her as she undressed. George lost his grip and nearly fell, but was able to drop to the street. As he tried to stand up, he was shoved by someone who was then struck by a car. George was startled to see that it was the same guy who had been staring at him at Lou`s Cafe. Rather than confronting the angry driver of the car, George fled the scene. On Monday at school, George was being tormented by Mark Dixon and another group of students, who had placed a "Kick Me" sign on his back. To make matters worse, the Mr. Strickland lectured him about being a slacker. As George picked up his books, he was not pleased that the stranger -- who now identified himself as "Marty" -- was again following him. The stranger claimed to be "the guy who saved your life", and then tried to introduce George to Lorraine, in what turned out to be a humiliating experience. Lorraine ignored George, and talked instead to Marty, although she called him "Calvin".
George tells Marty to stop following him.When George went to the cafeteria to eat lunch and to work on writing stories, there was Marty again, taking a seat at the table and asking to look at what was being written. Marty stated that Lorraine Baines wanted George to ask her to the Enchantment Under the Sea dance. George was reluctant to approach her, fearing rejection, and was not happy to see that Biff had taken an interest in her as well. When Marty went over to confront Biff, George left as quickly as possible. After school, George noticed that the annoying stranger was, once again, trying to catch up with him. Though George preferred to avoid confrontation, he turned on Marty and demanded "WHY do you keep following me around?!". And once again, Marty was trying to get George to ask out Lorraine. George had had enough, and told Marty that "neither you, nor anyone on the planet" was going to make him go to dance. That night at 12:23 PM, however, George would have an unnerving experience that would make him realize that the stranger was right, and that George indeed did need to ask Lorraine Baines out on a date.
In the early hours of Tuesday morning, George woke up suddenly to the loud sound of music and bizarre noise, to find himself facing what appeared to be a man from outer space. The entity, garbed in yellow, was not unlike a picture on the cover of one of George`s science fiction magazines. When George asked, "Who are you?", the visitor sent out another wave of deafening noise and said, in perfect English, "Silence, Earthling!" The spaceman then identified himself as an extra-terrestrial named Darth Vader from the planet Vulcan. "Vader" ordered George to ask Lorraine for a date or he would melt George`s brain. George overslept and did not go to school, but on Tuesday afternoon, he sought out Marty`s help. Marty seemed slow in some respects -- he apparently had never used a bottle opener on a vending machine -- but he had good ideas for things to say to Lorraine, and George took notes. George went into the cafe, ordered a chocolate milk to bolster his courage, and then walked up to Lorraine`s table. As he was getting her attention, however, Biff walked in. Biff, who had warned George never to come into the cafe, demanded costs. George was about to reach for his wallet, when Marty stepped in. Biff, who was tripped, and then punched, by Marty, chased Marty out of the cafe, and the gang followed. At this point, everyone in the cafe was noticing the stranger, and they watched a chase that ended with Biff and his gang crashing into a manure truck. George, who had found the courage to talk to Lorraine, was dismayed when he saw that she was clearly attracted to Marty. Once again, George walked away.
It was clear, however, that Marty was not attracted to Lorraine; and that Marty, for whatever reason, still wanted George to take Lorraine to the dance. Marty, who drove a fancy Packard convertible, presented George with a bizarre plan, and they discussed it while hanging laundry on a clothesline at the McFly home. To George, the plan made little sense. Marty was going to ask Lorraine out and take her to the dance; George would go to the dance by himself; Marty would pretend to "take advantage" of Lorraine, George would come to the "rescue" at precisely 9 o`clock; George would punch Marty in the stomach, Marty would pretend to be hurt, and George would win Lorraine`s heart. George was nervous about the scheme, but Marty assured him that he had nothing to be afraid of. Marty added, "If you put your mind to it, you can accomplish anything".
George dressed in a white tuxedo and went to the dance alone, as planned. Shortly after 9:00 pm, as the band took a break, George walked out to Marty`s car, witnessed a struggle inside, and, as planned, delivered his line, "Hey you, get your damn hands off her." George was horrified when he found out that he was facing Biff instead of Marty. He was about to walk away, until he realized that Lorraine was in trouble. For the first time, George stood up to Biff and said, "You leave her alone." An angry Biff then prepared to break George`s right arm. When Biff pushed Lorraine down, George`s fear turned to anger. George`s left hand clinched into a fist, and George threw a punch so hard that Biff was knocked out cold. George helped Lorraine to her feet and walked with her into the dance.
For a moment, it appeared that the dance had ended early, along with George`s date, because the band`s guitar player had injured his hand. The dance resumed, however, with a substitute; George and Lorraine were surprised to see Marty come on stage to play the guitar. George was dancing slowly with Lorraine as the band played Earth Angel, and he was unsure about kissing her. Suddenly, Dixon cut in on the couple and pulled Lorraine away. Humiliated once again, George started to walk off, until he saw Marty, and he turned around. Having knocked out Biff, George realized that he no longer needed to be afraid of a fight. George shoved Dixon out of the way, and kissed Lorraine for the first time. As the couple finished dancing to Earth Angel, a newly confident George acknowledged Marty.
George and Lorraine before the kiss.The dance wasn`t yet over. Marty began to play a song that nobody had heard, and everyone was dancing as Marty sang about Johnny B. Goode. As George and Lorraine danced to the fast-paced music, he found that for the first time, he was popular. Students were congratulating him and suggesting that he run for class president. The song ended unexpectedly as Marty began playing the electric guitar erratically, and although the dance music ended on a sour note, George`s newfound confidence was just beginning. After the dance, the couple agreed that they needed to talk to Marty who, after all, had brought Lorraine to the dance. Marty, however, was delighted that George and Lorraine had become boyfriend and girlfriend, and wished them good luck. George thanked Marty for his good advice. Before leaving, Marty joked that if George and Lorraine ever had children, and one of them set fire to a rug, they should "go easy on him, okay?" Although it was another odd remark from a strange young man, George laughed and replied, "Okay." George and Lorraine never saw Calvin Marty Klein again, but George never lost the confidence that Marty had helped him find. George later would pursue his dream of becoming a writer, and succeeded with a bestselling science fiction novel, A Match Made in Space, based in part on the mysterious encounter that had preceded his first date with Lorraine. By 1985, George McFly and Lorraine had been happily married for many years, and had three grown children, David, Linda, and Martin, the youngest of whom, coincidentally, was nicknamed Marty.