I have four kids and no favourite, whenever I am alone with any of them, (rarely) I think I couldn't possibly love anybody more than this child. When I have the four together (all the time), I'm ready to murder the lot.
My mother, unbeknown to me until my late teens, favours my brother. She doesn't mean to but she can't help it. He's a bit of a shit at times, and under extreme stress she blurted out to me, "I don't know why he's my favourite ", then looked like she could bite her tongue out. I pretended I hadn't heard her.
I was a bit shocked but kind of relieved, I had always known I was my dad's favourite and had felt guilty about it till then.
Why for you ask?