Yours Chelbie gave an excellent answer and is right on cue
A divorce will not change his obligation to pay child support even if the 6 year old is not biologically his. (Except if they live in Georgia were a law allows a presumed father who can prove he is not the biological father with DNA evidence to give up legal rights and obligations if he choses to do so
I read a whole article on this, the law will most likely side with her, there are many men out there who have been in this situation and even though proved the children are not his, they are paying as if they were. So much Justice for all. It was a Dateline episode I believe.
abr