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(you need an account to see links), you have some good wisdom sir.
Let me lay my opinion down. I think you should go to prove you want to be involved. It's not going to be a very valid argument to say you want to be involved if you don't show up for the event
I know sibling rivalry very well, and just remember who the day is supposed to be about and don't let it get to you. I know you well, and I know you care more than you want to admit even, so keep your chin up and be honest about the way you feel with both of them, but definitely go!