It's best you draw a line let your in law understand what you wish when baby out. If not there will be alot of arguments. Grandparents will dote their grandchildren the worst part is when they interfered in your teaching and what you want to do with your kids.
Hey, I can understand. Best would be to have a chat with your husband about it on how to deal with this going forward. May be have some basic rules but explain to the in-laws politely ?