He has two grandsons through Bill: Stephen, former defensive coordinator for the Washington Huskies, who now occupies the same position at North Carolina, and Brian, the safeties coach for the New England Patriots.

[4] During a portion of his military time during World War II, Belichick played for the successful 1942 Great Lakes Navy Bluejackets football team.

In 1956, Belichick joined the United States Naval Academy staff under Eddie Erdelatz, where he served primarily as a scout for over 30 years.

Steve Belichick was the youngest of five children born to Marija Barković and Ivan Biličić, who immigrated to the United States in 1897 from Draganić, Karlovac, Croatia and settled in Monessen, Pennsylvania.

[6][13] Their son is the former head coach of the New England Patriots and has cited his father, with whom he began analyzing game film at the age of 10, as his chief early influence.

His son has contributed to it in recent years, and it is considered one of the largest collections of football-related works outside of the Pro Football Hall of Fame.