Whenever we visit my Husband's parents. My mom in law always took control of my son. She feed him, napping, etc. It seems like i don't have permission to touch my own son. I know she might missed her grandson but i feel powerless. What should i do?

I know it's tough, but I'd take the welcome break. Let her spoil (within reason!) Baby for a time - at the end of the day you know she'll be leaving so you can then go back to how things usually are. At the end of the day, they raised your husband so they must've done something OK ;) Go to a spa and have some Me Time!