Sometimes saying less is more. Choose your words carefully - they might be hard to say. If you're worried about him, tell him that. Say, "I'm worried about you."
If you care about him, if you love him, say that too, "I love you. I care about you, and I want you to be safe."
If you want to give him permission to open up to you, maybe say, "Can you talk about it?" and listen. Sometimes the best way of showing you care about someone, is to listen to them. And who knows? He might have very little to say, or he might have a lot to say, and it will probably mean a lot to him that you listened.
There's ways of showing you care physically too. If you both feel comfortable, you can give him a hug. Or even something as small as touching his hand. I'm sorry; it sounds like both of you have been in some very painful situations. Do what makes you both feel safe. Remember; the love is still there.
Recreate the situation for yourself imagine if you were soaked in suicidal thoughts and was super depressed what would you want someone to say trying to convince him out of it is really cliche and seems like it would help but he won't take it the right way with a mindset of the state he's in
I know that when you hear some-one close to you tried to commit suicide you suddenly go blank.
But you need to stand strong for your brother. Hug him and kiss him, tell him he is the best brother in the world.. Molested is a horrible feeling. I was molested when I was a little girl, but right now your brother needs you and his family. Talk with him try and bring a smile to his face.
He needs you right now, stand strong:)
May God watch over your brother and help him see the right path:)