Deland McCullough, a former NFL player and now coach, was given up for adoption at birth in 1973. He found his birth mother in 2017. She told him the name of his father, who turned out to be his college coach and mentor throughout his adult life. – WTF Fun Facts
Source: https://www.espn.com/espn/feature/story/_/id/24505521/the-jaw-dropping-story-nfl-coach-search-family