Only until my sister was born, so 2 whole years of being an only child so the default fave
I was my grandmas fave, but thats only because I saw here much more than the others did, I was pretty much brought up by her as both parents worked and this was before free childcare and they were already skint despite working fulltime, so grandma had to look after me. Even when older, I kept seeing her more than the others (afer my mother kicked me out at 15..lived with my grandma for a few months til I got my own place at 16)
So I was
someones fave, just not my parents. I understand them hating me as a teen, as I was a horrific teenager and can see that clearly looking back. But even as a young child, I was never that affectionate and that where my sister was. So she was my parents fave I think.