In-law problems #2

So my FIL is constantly trying to undermine me and messes with my baby. He is always trying to tell me he can have that, he can have this. and I specifally say NO. He is 8 months old. He cannot have doughnuts, ice cream every day, chocolate candy bars. And he keeps trying make me feed him more meals throughout the days and other things he is just to young for. When I put him in his walker my FIL always pulls him back and forth and holds him back while he is trying to run away. 😠😠 Makes me extremely angry. and my son gets very mad at him to. We are still living with them and hopefully moving out this summer. Fingers crossed and so many hopefull prayers and wishes for it. I'm about to snap.