father is listed as Stanley Dunham and mother - a black prostitute from the Honolulu red light district. Maybe one of Frank Marshal Davis’ women he pimped or shared with Stan. That's why Barry looks so much like Stanley but not at all like his so-called African relatives. That's why the drunken lech Frank Marshall Davis was selected by Stan Dunham to mentor his “grandson”.
Stan made Barry the son he always wanted and his birth and inclusion in the family covered up by being passed off as the offspring of his daughter and an African “husband”
and yes, I believe Madelyn Dunham would have gone along with this to save her marriage, please her husband and to save face for the family, as long as her daughter could be passed off as “married”