Sadly for Malone, he IS earning his money on his own likely much better than the rest of Malone children ever will.
On the flip side, I am sure that while Malone maybe didn't see the kid or care about him, he did very likely pay child support as dictated by the court or otherwise agreed. If not, you would have heard about that for certain.
Plenty of other "baby-mamas" have really had to go it alone which would have been worse for Demetrious.
Still Karl is a bit scummy for the whole thing. 13 yrs old??? That really IS rape, no matter how you look at it. It was not a nubile and well developed 16 yr old honeypot who trapped him, it was a child.