Predictions: Who Are Jill's Parents? Where is Katherine's Child

OK the speculation is driving me insane!

Who is Katherine Chancellor's real child? Who is Jill's real mother? Who is Jill's Father can't be Arthur if Katherine is not the mother. Was it Big Bill? Is that why he adopted her? How happy is Billy that he is also an Abbott? Will Kane get thrown out with Jill?

Well some of you have given me your thoughts and it's time for the rest to chime in.

We have Katherine as either the mother of Esther and Nikki? Agree? Why or why not?
Maybe Katherine had a boy and foster home Victor is her son? (it's TV anything is possible)
We have Liz Foster and Charlotte Ramsey as potential mothers. Possible or impossible?
No Question Billy is happy as heck, and she fired him, oh this is going to be grand!
Kane well at least he found his mother even if he didn't hit the Jackpot!

Shhhh...I think Jill and Katherine are going to have another knock down drag out at Billy and Chloe's wedding. OOOHHHH Wait doesn't this mean that Mack and Billy aren't related? Ahhhh this can get really grimy!!!