Jasper,
Reading your further post clarifies things a bit for me, and I have something to say that I have thought about long and hard. I really dont know whether I should go down this road, and I need to tell you these are just my personal thoughts.
Awhile back I started a thread (Telling my father) about on a problem that was absolutely devouring me: should I tell my father what happened so many years ago? I was abused from the age of 11 until 14 by a man who worked with our Boy Scout troop, and he got me to shut up and let it continue by using the cruelest lies imaginable: I was a sissy and thats how he knew I would do this, if I told I would be thrown out of the house and end up in an orphanage, nobody loves me except him and my parents keep me only because I was their only son, my father is furious with me (for reason x, y, or z) so I should go with him until things calm down at home, doing this to you shows I really am the only one who loves you, etc etc. By the time it all ended I was an emotional disaster, and back in those days there was nowhere to go and no one to talk to about such things. So I coped by burying everything and going into denial; I somehow convinced myself that nothing had happened and I really must stop worrying about those childish bad dreams. But by some twisted logic I was also blaming my Dad, who was and is a fantastic person and a wonderful father. I guess I needed somewhere for the anger and fear to go and wanted to know why me. So there it is: he should have protected me. I became extremely difficult and rebellious, way beyond the usual teenage troubles, and for years into adulthood I was emotionally cold and distant from him. I am still ashamed at all the times I rejected or ignored his endless gestures of love and support. Eventually our relationship was restored, almost entirely due to the wisdom and kindness of my wife, but I still did not understand why I had been such a prick.
When I posted on the question of whether or not I should tell my father, the issue hinged on the fact that he is 80 years old. He would be devastated, of course, and I know he would feel terrible that this had happened and he knew nothing about it. I might feel better, but what good would it do him?
How all this fit together I didnt figure out until I read your second post here. I was overpowered by your first post but I wasnt sure why. I was writing to you about things you might consider, but I wasnt seeing the truth about myself. I was a victim, it wasnt my fault. I dont need to be forgiven. My problems with my father go right back to the poison I got from my abuser. In order to keep things going he was trying to deprive me of the first lifeline I might have grabbed at. And my father was hurt as well. My abuser took away from him all those years of love and affection that the two of us should have had and which he richly deserved.
Before seeing your thread I had decided more or less that I will deal with this the next time I am back in the States. Both of my sisters know about what happened and both will be a great source of support. But now I am absolutely determined! Both my Dad and I were robbed. We are both victims, even today. He does need to hear what happened. He probably wonders to this day what he did wrong as a father. Answer: nothing! He needs to know that, and I need to tell him. Its not just a way of telling that sick bastard: You lose. I dont know how long my father has hes in better health than I am at the moment

. But I cant allow him to pass away with that question on his heart. I owe him that.
You and Paulie are victims as well. Your older brother may have said things to keep you two from supporting each other, and going back and forth between you would already be enough to raise a barrier. You feel guilty because you are slightly older; Paulie may feel confused and angry for the same reason. But all of this is unresolved crap from childhood and the fault of someone else, not either of you two. You are both still being hurt even today, and as it happens, you are the one who is in a position to end it. That doesnt mean that it will be easy. There may be a lot of crap to work through, and of course in any one case it gets a lot more complicated than an outsider can understand.
On being gay, Im not gay myself so I cant comment from that perspective. But sure, that may have something to do with it. Paulie may not understand that being gay is part of who you are and not some lifestyle you picked up one day. The hurt child Paulie may wonder if you were gay even as a little boy, which attracted the attention of your older brother, therefore you got things started, blah blah blah. All nonsense of course, but still looks like there is a need to clear the air and do some honest talking here as well.
My huge fear here, Jasper, is that this is coming down as a way too heavy emotional post. There is always the chance, I guess, that an effort on your part could go badly wrong. I just dont know. All I can say is that thanks to your posts I know for sure what I have to do and why, and from what I can see it all fits your situation as well. But thats only my guess. Maybe some of the moderators with some professional experience would have some comment.
Good luck!,
Larry