I'm thinking of ghosting my mentally ill mother and grandmother
How are you going to ghost your grandmother?
I just avoid talking to her, she calls me up all the time.
I get that you may not want to have to deal with family members sometimes. Though you should be there for your family when you can, it's understandable to have healthy boundaries.
Thanks, i'll just pretend to not hear the phone.
It's rude to ignore your family all the time, as I'm sure you wouldn't like it if it were the other way around. It's normal to not answer the phone when you are in the middle of something important however.