I don't, but my oldest friend does.
My friend (A) and her little brother (C) was born as a result of a second marriage for both parents. Mum was previously childless (her marriage hadn't lasted long), and dad had 2 children. A boy (E), who was about 11 when they got together, and a girl (G) who was about 7.
My friend has a good relationship with her half-sister G. G was interested in her new siblings, and saw quite a lot of them as children.
The half-brother E hasn't really had any involvement with my friend since she was about 9.
I suspect half the issue was that A and C grew up very rurally on the maternal grandparents farm. The half-sister loved animals and the rural life, and so was happy to visit. The half-brother had zero interest in rural life, farms or animals. He didn't want to spend his contact time with dad stuck on a farm in literally the middle of nowhere. He wanted to be where his mum lived - the city. So as soon as he was old enough to express a preference (which came very soon, as he was 11 when the relationship got going), he just stopped coming.
My friend is 40 now and has close to zero contact with her half-brother. They are pretty much birthday and christmas card only. He's never met her children, who are 13 and 11.
Her younger brother C is 38, and as far as I know, he has no contact with his older half-brother.
As far as I know, there was never any big falling out. It was just the age difference, and the difference in preferred lifestyle, was too great.