[anonymous]

Another thought, maybe you should do an intervention with your Grandma? If she has taken on too many pets to adequately care for and provide medical attention for, maybe she should consider contacting local animal control or a local feral cat rescue group for help placing the animals elsewhere?
Fleas are disgusting, everyone in the house will get sick if this situation doesn’t get under control.
I apologize if I am being blunt, I am only trying to help.