While having a will is a good thing, Your aunt left you the money, and it is absolutely not your mother’s decision of where you leave it. Family money or not.
If she is so concerned about where the money she wants to leave you will go after you pass, she can bypass you completely and give it directly to your children and grandchildren. She’s using money to control you.
I bet she was a nightmare when you were raising your children.
Humza Yusaf's resignation speech