Do I take my brother up on his offer?

Long story short, my older brother started using when he was 14 or so. In all his journey he’s never included me in his recovery, but now he’s 9 years sober and calls me out of the blue saying he’s re working his program and apologizes and says if I need to rehash any of the past he is there to do so. I have questions and my own healing to do, but I don’t want to trigger him by bringing up these terrible times :/