Mother I said I mourned the life I thought we'd be having, which I believe - from having read threads on here and in RL - can be a common reaction. It wasn't drawn out, I didn't dress up in black for years a la Queen Vic, it was just something I thought when he told me. As I said, I am human and I shared what I felt. I believe that is what online anon forums are for...
Does your sister express her sexuality has her "choice"? I would have thought most gay people, like most straight people, would see their sexuality as pre-determined and not of their choosing.