Lady Lee- what an awful amount of sadness you've been carrying around with you all these years. You must be a woman of incredible strength, because even with all that, you are always so kind and humane to everyone on this website, and you seem to have the clearest head of all of us here.
I had a messed-up family, too. I've lost track of my brothers, and they of me. It hurts every day, mostly just a dull ache that I can handle, but when something big in my life happens and I'm not even able to pick up the phone and tell them, I'm so wrecked by the loss that I find it hard to act happy on what should be a happy day for me. My advice to anyone in this situation is, do what it takes to at least have contact with family members. It may be expecting too much to think that the relationship will be perfect, like nothing ever happened. But if you can at least talk on the phone every month or so, you'll at least have the chance of re-connecting emotionally with them, in time.
Your brother is lucky to have a sister like you, I think.