Dear Annie: My mother-in-law ignores the boundaries we set for our child

DEAR ANNIE: My husband and I have a 3-year-old daughter, and we’re trying to raise her with structure -- regular bedtime, limited screen time and no sweets before meals. The problem is my mother-in-law.

She watches our daughter twice a week, and despite repeated conversations, she ignores every boundary we set. She lets her stay up late, gives her fast food for lunch and parks her in front of cartoons for hours. When we remind her of our rules, she says things like, “Oh, come on, it’s just Grandma’s house.”

My husband agrees it’s a problem, but he struggles to confront his mom. I don’t want to be the “bad guy” daughter-in-law, but I also don’t want to spend the next few years undoing the habits my child picks up over there.

How do I set firmer boundaries with someone who thinks the rule