I tend to take more after my dad's side of the family in terms of phsical characterististics, where there is a inherited premature hair loss. So with my thin hair I assumed I'd be losing mine, well, about, now, really, and I'd long since accepted that this would be the case. Not too happy about it, but there you go. But as it happens, I've not started losing my hair yet.
My (younger) brother also assumed that I would lose my hair, and not him, as as he takes after my mum's side of the family, which doesn't have the hair loss, and has always had thicker hair. Bit surprised to seem him a couple of years ago after not seeing him for about a year - he's noticeably losing his hair. Looks like he got that gene, then