Not stubborn or stupid. Staying with in laws can indeed caused friction and unhappiness. Every mother will treat their children like kids even though they are already grown up. Your hub can try telling his mum firmly he wants to do all these. She will see it differently if he's the one telling her.
My pils would stay with us occasionally but will stay permanently when my baby is born. My mil will always do some chores so that my hub don't have to do. My hub will tell her not to but will let her do some simple chores like wash dishes so she will feel herself useful.
My pils and I are ok but there are bound to be some small unhappiness as our living habits are different. I guess both sides close one eye. ;p Most of the times I will tell them directly as we will be staying together for long term. So far they are receptive of my feedback. It really depends on your mil's character and your relationship with her. If your mil and you are ok and the stay is temporarily, can consider it. After all, she's old already. But of course if both really cannot click, then better don't.
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