Should I prank my aunt and make them think my grandpa died.
Why would you want your aunt to think your grandpa is dead?
She always talks about us when I eat in front of them.
Lying to people about a death in your family is a terrible thing to do, especially when you're doing it to other family members. There is no good reason to try to convince a family member that someone they love has died. You are just going to cause them pain and suffering for no reason.
Who cares, they deserve it. I don't see why my aunt gets to talk shit whenever they want.
There's really no excuse for making someone believe their family member has died. If you have a problem with what your aunt says to you just kindly ask her to stop. You'll have better luck asking her to stop that playing a cruel trick on her.