As a child I perceived that my brother was the favourite.
In later years I grew up and went to my parent and asked my Mum why he was the favourite. She was "gobsmacked" as she did not know I felt that way.
She explained that I had far more spirit and that I was a naughtier child however far more fun than my brother.
It put a whole new slant on it for me, as she also said I turned out better than my brother.
HoWEVER, and it is a big one, by now, I think the damage was done as I always thought I was not clever enough as my brother always came first in his exams and I didnt. My mum pointed out that I never studied like he did, and had I done just a bit of work I would have been brilliant at school.
So, as a child one perceives things that are not necessarily so,