Mr. Santos, under scrutiny for lies about his background, is set to be sworn into Congress on Tuesday even as records, colleagues and friends divulge more about his past.
Genealogy websites cited by The Forward suggest that Mr. Santos’s grandparents were born in Brazil, and were not “Holocaust refugees,” as he has claimed.
The decision by the Maryland Democrat, who has served in Congress for four decades — two of them in leadership — reflected a generational and demographic shift afoot in his party.