Old people will spoil bad children when they take care of them! If you can bring your own, go and see the old man when you are free. It's hard for you to get rid of old people's habits! How old is the child? Can you send it to kindergarten? Let children have less contact with grandma, and usually tell their mother-in-law that children should develop good habits from an early age, and bad habits cannot be changed. Just tell her that she won't listen, and bring her fewer children to see if she will insist. Communicate with her well and be reasonable.