

Nobody here can really give you specific advice based on the few facts. You’re part of this family, you know them better than all of us. If you feel off about it, there’s a reason for it. You’ve come here to ask the question. So I think you’re well within your rights to reduce contact with that side of the family. I would only suggest you quietly ghost rather than making a big stink.
Most of us don’t have the luxury of choosing our families. We can just try to do the best with the hand we’re dealt. I’m sorry for your loss.
Maybe delete the picture, put the phone down, and try to think of 20 great things about your grandmother.