In an issue of Nintendo Power UK they mention a Koopa called Clawdia Koopa. She was The Koopalings mother. Then some weird incongruence came with Bowser Jr. appearance Then in a September 2012 interview, Shigeru Miyamoto stated that the Koopalings were NO LONGER considered by Nintendo to be Bowser's children, rendering their maternal parentage a moot point; he also asserted that Bowser Jr,'s mother was simply "unknown" Also all of them look VERY different from each other, Bower might just fucked a lot of Female Koopas and those lil bastards came from them. Or probably Bowser just adopted them. And Bowser Jr.... Heck if i know. But if this was the case... God damn, Bowser. I guess your days of spending a fortune in a Koopa Army and kidnaping Peach are over because of the evil, ancient and dark curse of... CHILD SUPPORT!
Peach dumps the kids on Bowser, and says she's not responsible for them anymore. Reminds me of that episode of Futurama when that soda machine had a baby with Bender and she dumped all the responsibility on him! She then came back when their son was a teen to take their kid back! That would make an awesome sequal, have Peach wanting the Koopalings back!