Car Talk Puzzler: Citizenship

Ray: I was encouraged to use this by my brother. My older, wiser brother. When I first put it to the group, Rogers said; "Oh that's bogus." Berman said; "ehhhh." Catherine, as nice as she is, reserved judgement and didn't say a word. My brother said; "Ehhh, it might fly?" Here it is: Two girls are born of the same parents, but not at the same time, otherwise they'd be twins, in Boston. One of them, however, is a citizen of the United States and the other is not. How could this be?

Tom: And one did not give up her citizenship.

Ray: Which I'm sure you will do after we lose the election.

Tom: Hey, you ain't just whistling dixie!

[ Car Talk Puzzler ]