I'm sorry, Ales...I think the answer is that you have to release him from being your validation or your healer.
I think you can't pressure him about it any more... Because you want him to be your brother.
Please, think about this. Right now, in this particular decade of your life...you feel driven toward extracting your brother's understanding. (I don't blame you! At all! I know how overwhelming that need can feel.)
What I'm saying is, your brother sounds like a good guy who is willing to be in your life, still. He has not thrown you away or rejected you or said he wants no sibling...he's trying, in his own way.
But he is a guy with his own injuries and limitations, which he has to figure out in his own way and in his own language and in his own time. You really, really cannot "impose the truth" on him. I write this because my fear is, if you keep trying, you will eventually become toxic for him.
He won't be "right" (that's not what I'm getting at) -- but he may not be constructed in such a way that he can handle your emotions.
So, back to your enormous and legitimate and understandable need for validation about what it has been like to have an Nparent. It is unfortunate you can't have the simplicity of that bond, that healing comprehension, with the person who experienced his own (separate) childhood in the same home...but the message, loud and clear, is that this is not the healing source for you.
Therapy, support, healthful group work, on and on, art, soulful discovery, developing your own strength and joys -- other friends, the companionship of women, the natural world, a passion for a cause, new friends of any ilk --- these ARE your healing sources.
You could badger and implore your brother for understanding so often and so intensely that he recoils, in self-protection, because for his own legitimate reasons, your needs are overwhelming him.
So my advice is, stop it. Stop overwhelming him.
Family members DO lose each other, when they cannot recognize boundaries. (Which is exactly the damage Ns do to us...they leave us not able to stop. We can learn it but we can have so many damaged relationships before we do.)
Because if there is anything beautiful in this world that would be lovely -- it would be to have a kind brother. Even if you only talk to him once a month, or see him once a year. To let him be only that, instead of who you wish he would be.
I truly believe that at 50, 60, 70 -- you would be so glad you eased up on him now, began to cherish and celebrate his simple existence. Just as whoever he is.
You have a brother. A decent person.
What a miracle.
love,
Hops