this appears to be more and more common, as the illegitimate seek a kind of quasi-legitimacy...I don't know the legal basis, but it sure isn't the first time I've seen a child born out of wedlock somehow sporting his sperm-donor's legal name.
It's part of what I predict will happen after same-sex marriages take effect. Wives and mothers will no longer have the protection of conventional marriages--any time "hubby" wants, he can have a de facto second wife, which will divide the community property into smaller increments.
I do like to think of a certain ultra-liberal trophy-wife when BigBucks brings home some competition...at present she is very pro gay marriage... And I sure wouldn't blame the widow. How humiliating.
re: Sheesh. My only question is how his mistress's child came to have HIS last name?)))
You can put any name you wish on the birth certificate, it does not have to be the surname of the unmarried mother, in fact it does not have to be the surname of either parent, married or not. You can make your children's surname anything you wish when filling out the birth certificate.