maybe this is just an oldest sibling thing but growing up i always felt like i had to interfere and be the moderator for family fights, which i quickly found out was so bad for my mental health.. ultimately i don't think they want to be fighting either and they'll always find solutions on their own
u can't and shouldn't be able to control everything including whether or not your family is getting along... u also just cant stress yourself out over other peoples' beef.. got enough to worry about in ur own life