(6 July 1945 - 27 January 1967) (his death) 2 children
He was enrolled in public elementary schools and went on to attend Mitchell High School. Grissom met and befriended Betty Lavonne Moore at school through their extracurricular activities.
As the war neared its end, Grissom sought to be discharged. He married Betty Moore on July 6, 1945 while on leave, and secured his discharge in September. He took a job at Carpenter Body Works, a local bus manufacturing business, and rented an apartment in Mitchell. However, he had trouble providing a sufficient income and was determined to attend college. Taking advantage of the G.I. Bill for partial payment of his school tuition, Grissom enrolled at Purdue University in September 1946. During his time in college, Betty returned to live with her parents and took a job at the Indiana Bell Telephone Company while he worked part-time as a cook at a local restaurant. Grissom took summer classes to finish early and graduated with a bachelor of science degree in mechanical engineering in 1950.
Grissom and his wife Betty had two sons: Scott (born May 16, 1950) and Mark (born December 30, 1953). He greatly valued being home with his family, stating that "it sure helped to spend a quiet evening with your wife and children in your own living room." His wife Betty accommodated his hectic schedule by completing major chores and errands during the week so weekends would be free for family activities. She did not wear him down by constantly grilling him about the details of his job. In turn, Grissom refused to let work problems intrude on his time at home and tried to complete technical reading or paperwork after the boys were asleep. Gus also introduced his sons to hunting and fishing, two of his favorite hobbies.