Meddling / Controlling Mother-In-Law?

Wow it sounds like you married a man who was already married to his mother. I would confront her and tell her to back off or she will never see her grandchild and if your husband backs his mother then take the baby and go to YOUR mothers house and give him the ultimatum that, "you either back me and we raise this child together or you back to your mommy and continue to allow her to whip you like a little child. Grow a back bone and be my HUSBAND first and her son SECOND!