I'm going to ask an older man to move
Why are you going to ask the man to move?
The main reason is because I really want to live with my sister in this house.
You should not ask an elderly person to move, without first ensuring they have the resources and the capability to do some. You may be putting the man in a tough spot as he might not have anywhere else to go.
Fuck the old man.
You are being mean and callous here. You should not let put that old man out on the street like this.