I have no siblings or children of my own and am single.
I think the fact is that parents of 3 small children probably are very busy and it doesn't mean they are rejecting you--as a single person w/ no children, your life is different.
Yeah I will forget about them as they are not worth it.
Who on earth knows what this people have in their minds?
Probably they think that if you have never had a close relationship, why to bother
I do have friends who I see often, but I suppose I wanted some blood ties.