These links go to "friend of a friend" type comments. I'm not saying that it didn't happen that way, but these aren't sufficient evidence to take to an argument with a coworker or family member.
The email at one link has
Ann Durken, mother of Obama, at age 18 visited Cuba , with a group to give support to the Castro government. During her stay in Cuba in 1960, she was involved with voluntary work living in a commune in the central zone of Cuba, where she met a young Cuban Francisco Cundo from the town of Sagua la Grande....When Ann left Cuba in Dec 1960, she was 2 months pregnant. When she went back to Hawaii where her parents lived, she continued her studies at the University of Hawaii in Manoa where she met Barack Obama Sr., with whom she married in Feb. 1961It doesn't inspire confidence that they misspell Dunham's name.
Um, did Stanley Ann use an alias to travel to Cuba, perhaps ‘Durken’?