Unfortunately he already is in his old age (81). Since my mother died in January he seems to have gone into a sharp decline (mainly, I think, serious depression rather than dementia, but at that age they can present similarly).

I am going to have to relocate and look after him ASAP, I fear.

When I came out as bi at 17 my mother said she'd rather I'd told her I was dying of AIDS and my father grabbed me by the hair, threw me to the ground, and kicked me. So I don't have very high expectations on the tolerance front.