 Kneitel is married to Ruth Fleischer, becoming Max Fleischer's son-in-law, Dave Fleischer’s nephew-in-law, and director Richard Fleischer's brother-in-law.He was also the nephew of musician Sammy Timberg, who wrote many of the scores for Fleischer's cartoons.Kneitel also had a cousin Abner Kneitel, who was the animator and assistant animator for Fleischers and Famous from 1935 to 1944.