Some of these recollections are horrific.
Mine is insignificant in comparison but I just want to offload.
My parents were/are lovely (especially when you hear about some of the things on here) but my (younger) db was very difficult. As a result, I learned to be the "good" older sister as he took up all most of their attention.
This pattern has continued all our lives. It's something I eventually identified during counselling following the first of my miscarriages and did have the chance to talk about it with my mum. She acknowledged that it had been very helpful that I had just got on with things, which had allowed her to concentrate on db.
Dh for many years has been fed up with "our" family always coming second with my parents to db and his various problems "because we always cope".
When I had my 2nd MMC, we deliberately didn't tell my parents while it was happening (hospital cocked up with multiple scans all saying the same thing) as they were about to go away on a long-planned holiday and were at the point of cancelling it because db was separating from his then wife (as he had started a relationship with someone new). When they got back, we had them over for dinner to bring them up to date (we'd given db a lot of support while they were away) - and told them about the MMC. They said, "That's awful, now about your brother....." 
(To be fair, they rang the following day to apologise)
Roll forward to our early 50s (
). Mum, who had been the mediator (although with hindsight, had perhaps also enabled some of this behaviour) has died recently following a really nasty illness that has left scars on all of us. Db insists that we (db, me, dh and my parents - just df now but including the time before dm's illness) are a dysfunctional family because we "only" meet-up once a fortnight for supper and don't see each other/accept invitations in between times (might have something to do with the fact that we're usually only given a day or two's notice and already have something else on) 
We're at a "family conflict resolution/counselling session" (long story - but df paid for them to try to resolve the "issue" that db has with him - and even more so with me). I've just unburdened myself, emotionally explaining why it had hurt always having to put db's needs ahead of mine and although I understood and didn't blame my parents for what they did, I was starting to learn to put my own family's needs first (ie dh and ds) - and that included looking after myself and not always putting others' needs before my own.
Db looked at me in absolute horror and said, "But you're supposed to put other people's needs ahead of yours."
Db is now refusing to go to dinner at my df's if we're going - so we now go alternate fortnights. 
I feel very sorry for my dad. Even though he says it is db's problem - he is the one left in the middle.