How to stop siblings from hating each other?

well, i have a brother and so ive decided what works best is keep them apart until they growup and stop hating each other. maybe you should remind them whqt they like about eachother? this sounds kinda weird, but if one of them died suddenly, the other would probably feel bad fo being mean to eachother while they were together. you could remind of that? idk. its just a brother sister thing of hating each other though. you just have to wait for them to grow out of it.