This point keeps coming up on threads about only children. I have an only ds who is 6 and I am an only though fortunatley both my parents are fit and healthy.
Of course, should either of them become ill/die I will be devastated, but would it be any easier if I had a sister or a brother? I could have a sibling who did not give a toss or who lives overseas.
I have a group of fantastic friends who would be as supportive as any sibling, if not more.
I just think it's an interesting point for discussion.