I would think since he isn't paying a dime in child support, he doesn't take K on his days anyway that the courts would look at that. Doesn't he not show for his weekday visits?
That is my fear too BS. You are right, it probably is driven by $$. He knows if you want right now you can take him to court for the back CS he owes you.
Ok, another reason to cut off your MIL. She is playing both sides and you know is telling your H everything you say.
Get an attorney...Get the money somehow.
Me: 46 FWS: 36 Married and Divorced 4/07, Pregnant 7/07,False R 7/07 Baby Girl born 3/08 Kicked him out because OW: 7/08 5/10 He realized what he had and lost. Moved home! REMARRIED 3/14/11!!