The stories from adult SC here have brought one of my own to mind. My parents (Mum and StepDad) married when I was 14. I was a HARD teen to parent, I recognise that now. My StepDad ("John") was in his 40s, no kids, never married before he met my Mum. It couldn't have been easy for him.
He knows that I've always said "StepDad" to those who don't know him, and spoken of "John" to his face and those who do know him. I've always been referred to as Shirley or Stepdaughter by him. I love him dearly.
Last week, decades since he married my Mum, "John", I and other family were chatting. One of the family pulled my leg and "John" quipped back, "Oi! Don't you take the mickey out of my Daughter!". Then again, "Cheeky so and so, that's my Daughter you're taking the rise out of!".
That was the first time that, despite our close relationship, I've been called anything other than Shirley or "My Stepdaughter" although I've always known he views me as his own and my DC as his grandchildren.
I'm old enough to be a grandmother myself. Despite my advancing years I just GLOWED with pride when he said that.