Well...
She is my stepdaughter but I've raised her since she was 8 and she treats/depends on me more than her biological dad. Her daughter, my granddaughter, has only met her biological grandfather twice in her life and she turns 7 in two weeks. I am her grandfather.
When my stepdaughter's son passed away a few years ago I was the one who did all the dad stuff and was included as the father in the sacred Native American of washing of the body and dressing him in a ribbon shirt before the funeral home picked him up.
I never asked to be either of Mrs PokerDog's kid's father, I just tried to be a good person in their lives and give them the love and support they deserved. They both call me their dad and it's one of my greatest honors.