All you have to do is speak up. Tell him straight up: "I need you here to protect and provide for us, to give us security in our lives, to help raise these children, to set an example for this boy, who needs to see what real men do, and for this girl, who needs to know what a real man is so she can find one of her own someday. I need you to be the head of this family." Lay it out like this, and your requirements will trump his mother's every time.