ANSWER:
Yes! What they are doing has nothing to do with being good to them.
You must at least give them a phone call or text message once in a while and say salam whenever you meet.
If your father is dead, the house belongs to you and your mother if you have a brother or you parental father is alive. You can go to the police and ask them to leave as they have no right in living there nor in forcing themselves on you.