My girls are 13. Different personalities but used to be close.
Dd2 having awful time with anxiety atm. Panic attacks, skin picking and a self harm incident. She is withdrawing from friends. She has always been a bit prone to lashing out at her sister.
Dd1 is a full on Kevin, tantrums, not getting on with dh, very jealous of dd2 as a result because dh is involved in dd2s sport.
Dd1 is Dd2s biggest anxiety trigger. She makes nasty comments about dd2 being weird or smelly or scruffy and friendless. Dd2 then lashes out and it all ends in tears.
Dd1 thinks she gets all the blame and that her dad is always on dd2s side. We do tell dd2 off but dd1 is pretty insidious and gets right up in dd2s face. She's also a very unreliable narrator (lots of benign incidents where she exaggerates) and we don't see as much from dd2 as dd1 claims.
Dd1 is actually usually a very sweet kid. She is a lovely friend and very kind. Except to her sister. I think she is very jealous of dd2s relationship with her dad plus dd2s oddness at school embarrasses her.
As you can imagine I'm very protective of dd2 atm so hyper vigilant of any stress. I am trying to get them to keep their distance from each other. But I feel shit. I feel like I am being torn between my children and my lovely happy family is falling apart. I know siblings don't have to be close but mine were and it's making me so sad.
How can I manage this better? DH is highly pissed off with dd1 so I'm constantly trying to improve that relationship too. I'm exhausted tbh.