Irwin Winkler is that Henry winklers dad?

Henry Winkler and Irwin Winkler are not related.

Henry Winkler is an American actor and comedian best known for "Happy Days," "Barry," and "Arrested Development". He was born in New York in 1945.

Irwin Winkler is an American film producer and director best known for "Rocky," and "Goodfellas". He was also born in New York, in 1931.