Neta Prefontaine, Steve's older half-sister said that “he was crazy. He would run right over a car if it was in his way. One time in college, he put a bag over his head, stripped down and streaked right through the River Valley shopping mall. He ran out the back door and his coach [Bill Dellinger] was waiting for him, and said: ‘What the devil are you doing?’ Steve said: ‘Well I put a bag on my head so no one will know it was me,’ and the coach goes: ‘Gosh, Steve, you run through town most days with no clothes on besides shorts, don’t you know everybody knows who you are?’
Linda Prefontaine, Steve's other sister said that “he was the typical older brother. Growing up, we had a lot of fights, but there was still always that love and when it came to sticking up for each other, covering each other’s ass, we always did that. In high school he stopped picking on me and it started becoming a really good relationship between a brother and sister. We were really good athletes so we understood and supported each other on that level. In college he’d come to my tennis games and I’d go watch his races.
Michael Fleming, his nephew said he would babysit me as a young child. The memory I have is of him setting an American record over 2,000 meters as a present for my ninth birthday. He told my mother he would do it a few days beforehand, but I didn’t know when I was watching the race and after, my mother turned to me and said: ‘You better go talk to your uncle.’