Please help me analyze it. Is it normal for grandparents not to give their granddaughters lucky money?

People want grandchildren, so that's it.

It's also possible that the old man thinks you have good conditions. You don't have to give it. Ask your husband to give grandma some money first next year and ask her to give it to her daughter. As an indirect reminder,

Or you gave them two bags, one for them and one for their children.