Sometimes it can be the parents fault when siblings fall out.
My Mother has always played my Sister,Brother and myself off against each other and it's taken us all until middle age to fully accept that's what she's been doing but it's caused us to have a fractured relationship at times.
My Sister and Brother rarely bother with my Mother anymore but as the eldest i try to keep the peace between them all. My Mother is now 80 years old and in poor health and only my youngest Son and i bother with her anymore & that's sad.
We do everything for her and my Sister and Brother ( who do nothing) constantly ask me "why" and the only answer i can give is " i know she's toxic and i know she's been horrible but she's my Mum".
My Mum's latest thing is mouthing off about changing her will and leaving everything to my Son and i but i've told her her in no uncertain terms that if she does that then i'll stop seeing her too as that would just wreck my relationship with my Sister & Brother but i have the feeling she'll have the last laugh from the grave and drop a grenade into our lives after death.
I don't like my Mother but leaving an 80 years old Woman in ill health to fend for herself isn't something i can do, no matter how awful she's been during her life.
Family can suck but i suppose i'm that family member who feels a sense of duty & i get used because of that but i am what i am & won't change now.
As long as my Mother doesn't change her will, i believe it'll take her death to bring myself, Sister and Brother closer together & that's so fcuking sad.
My four Children have their moments but i'd be mortified if they ever fell out and stopped seeing each other, i don't know why my Mum takes so much glee out of seeing her Children do it but she has and still does.