No, he didn't. Gavin Newsom is NOT Nancy Pelosi's nephew. His aunt was married to Nancy Pelosi's brother-in-law, and they divorced in 1977.
https://abc7news.com/are-gavin-newsom-a ... /10693194/
Gov. Gavin Newsom's aunt, Barbara Newsom, was once
married to Ron Pelosi, Nancy Pelosi's brother-in-law. Barbara Newsom and Ron Pelosi divorced in 1977.