I'm going to leave my 18 year old diabetic brother at home alone. What do you think?
Why would you do that?
He's old enough to take care of himself and I'm sick of him demanding me to do things for him all the time.
He sounds like he's taxing your patience. It's not a good idea to leave him home alone if his health is really bad, though.
Eh, he'll be fine since he's been living by himself.
If you really trust that he can be home alone then I guess it's okay. He is an adult so it should be that hard for him to take care of himself.