Grandpa is a NPC in Lakeview Cabin IV. He is located inside The Mansion. When you enter the room he can't see you, because he is facing the other direction.

He is not very dangerous and if you have a weapon you can take him out with ease.

Sometimes there is a trap door in front of him and when you sound the alarm there is a chance he will fall in the hole.

Next to him is a clock which opens a secret door if you active it.

He is bald (or has a small amount of hair) and wears grey clothes.