Did your mother-in-law say how much it costs to buy things for grandchildren? In my family, she said how much she would pay for everything, as if she didn't want to.

I don't think you should treat your mother-in-law like this. You should know that she has a hard time. Don't make irresponsible remarks about old people. She has to live by raising a son and marrying a wife. People of different ages have different ways of doing things. When you want to be a mother-in-law, your daughter-in-law, like you, has some things that she doesn't like about you. Do you want her to judge you? Respecting the elderly is the minimum etiquette for the younger generation. Besides, you are going to have a baby soon, so why bring your bad mood to your child? Empathy, the old man must have done something thoughtless, but she never deliberately made trouble with the younger generation. Be kind to the elderly. Think about how hard it is for them to raise their children, and you won't care so much.