Of course I would not put up with it if he was alone with me but it's a bit different when mama is sitting right there and/or I am at her house.
I also have a 10 year old granddaughter who would not pull the things with me that she does with her mother. She used to have the habit of EVERY SINGLE PLACE we/she would go, she absolutely HAD to use the restroom. I started to see it for what it was. She could make the adults do what she wanted, interrupt dinner at a restaurant, whatever, by making them take her to the bathroom.
I took her out to brunch one day, all was fine, and I happened to be looking at her when she saw the door to the bathrooms. She immediately said, "I have to go to the bathroom." I told her she could wait, I wasn't leaving my meal to get cold and she could finish eating first. She sulked for a few minutes and then totally forgot about it. She doesn't do that with me anymore.