Fran Tarkenton began his pro career with the Minnesota Vikings in 1961, but the Vikes did not have a lot of talent around him. The scrambling Quarterback was a star and was a Pro Bowl Selection in 1964 and 1965, but he grew frustrated and demanded a trade. That wish was granted after the 1966 season, when the Giants, hungry for a top Quarterback, traded four high Draft Picks for Tarkenton.
Brad Van Pelt was a two-time All-American at Michigan State, thus bringing a successful resume to the New York Giants who drafted him in the Second Round in 1973.
Playing for your dad is hard. Playing for your father-in-law has to be harder. This was life for Chris Snee, a Boston College product who married the daughter of Tom Coughlin, who became the Head Coach of the New York Giants in 2004. That was the same season that the Giants drafted Snee in the Second Round.
Steve Owen achieved far greater notoriety as a Coach, but he was a very good football player in his own right and one of the first real stars of the New York Giants.