I remember hearing this happen YEARS ago. I think I saw it on Dateline maybe.
Anyway, Mom had twins, one was white and one was black, they were faternal twins.
Turned out that the mom who was white and married to a white man, had sex with a black man while she was separated from her husband, but she was still having sex with her husband too. DNA tests were done and the man that she had an affair with was trying to get custody of the black twin. Meanwhile, the mom and her husband reconciled and they were fighting the custody because they didn't want the twin brothers to be separated.
I'm not sure how it turned out. I remember thinking that her husband must be one he!! of a guy, he was willing to love, care and fight for the one twin that wasn't even biologically his.
I'll try to google and find it because now I want to know what happened!