I don't know what to do you see I want to masturbate but my grandparents are in the room so I cant and they will be suspicious if I left the room
go to the bathroom. No one pays much attention when people go to the restroom for a while. Just try not to give yourself away.
all you have to do is go into the bathroom and run a bath or shower and do it in there...they wont suspect a thing :]
go to your room. act as if you need to take a nap or you just want some alone time.