Due to a couple of house moves into and then out of an area with a middle school system and then to an area with boys and girls schools my brother and I were in separate schools most of our school lives.
Even when we were in the same school we hardly saw each other.
I hated my secondary with a passion but not because my brother wasn't there. It game me a chance to be me, not the 'little sister of'.
The downsides were differing inset days, clashes of concerts and sports days and parents evenings tbh.
Considering I was at the RC girls' school and my brother was at the RC boys' school you would have thought that the schools would communicate.
The mixed VI form was at the boys' school, the boys' school were doing some fundraising and wanted VI form girls to do something, I think it was to have a new hairdo to advertise a hairdresser, but they planned it on the same evening as the prize giving at the girls' school the VI form girls had just left and we all had prizes to collect.
A few years later, when easter was either late or early the two schools had different Easter holidays.
Sorry going off topic there.