I know my brother was favoured over me by much of the family, despite protestations to the contrary. As a child he was always allowed more privileges, got away with more. It was mostly my dad's family, who were all very very chauvinistic (including my dad).
I even remember my dad telling me how much happier my grandfather was when my brother was born because it was a boy to carry on the family name.
I remember being hounded to get a Saturday job as soon as I turned 14. My brother never worked until after university.
I remember being told I wasn't working hard enough when I was studying for hours and my mental health breaking down, whilst when my brother's exams came around he sat playing on the computer and doing bugger all (he's brilliantly clever and always did better than me regardless - that's not my parents doing though!).
I remember my dad wandering off to take work phone calls on my graduation day whereas at my brother's (Cambridge) graduation nothing could have torn him away.
Just after I'd been made redundant and had to move back in with my parents I remember some family friends were invited around, and my dad boasting on and on about how well my brother was doing with such little effort. To the extent that my parents (lovely) friends commented on it to my mum (I overheard them from the kitchen).
I have a huge huge problem with never feeling good enough and always feeling like I've messed everything up. I have no confidence. I always have to seek reassurance.
I know where that came from.