I know exactly what you mean, there are times where you really just want family. I don't have a sister so I really feel the lack of female blood relatives. Mum's mum died 2 years ago in June. I have cousins I am close to but all of them have sisters of their own so I always feel like the lone female. My brother is lovely but still not a woman and whilst his wife is great too she has a sister so doesn't need me in that role.
I feel lucky that I have 2 daughters, my oldest daughter is a great help and support (mostly) so at least I have that.
I hate it at work when people complain about their mothers because i would give anything to have mine back.
Maybe we should form a motherless support group of our own.