There is something that to be said about the relashionship between siblings living in a dysfunctional family.
It's always different for everybody - in some families there is a favourite, in some families there isn't one; parents may have their children compete for love (or the neglective version of love, aka not being the punching bag) or withhold it altogether; siblings may stick together or throw each other under the bus.
There's always so much history and pent up emotions - from love to pity to hatred to betrayal to anger to graditude.
And it's messy, it's complicated, but most of the time all the horrible shit won't be taken to heart - because you all know that in a toxic family, you play by different rules.
In a family like this, there is no room for bad blood between you - there is only room for the things necessary for survival. And maybe later, when you're all safe, there will be a place and time to grieve for the trusting, loving relationship with them you never got, just like there will be room to grieve for everything else - the lost youth, the person you were, the person you could be and all the little things.
But not now. For now, you'll forget about everything and keep going, not even acknowledging anything. Because what else is left?