I would think your mom is aware of these matters. I assume she's not mentally ill to the point of psychosis or demented. Beauty is skin deep. if he treats her well, then that's what counts.

As far as taking care of him, we can't tell the future.

It sounds as if he needs a loving "daughter."

That's why I say what I do.

P.S. I am 61 and I don't think of 70 as being "very, very old." I am also disabled, but I believe I am good company.