There are two things that I think we can do to help Jacob the most right now:
1. PRAY FOR HIM! always! It's incredible how the Lord answers each and every one of our prayers. He knows us, and Jacob, and will do what He knows is right.
2. WRITE LETTERS! I don't think any of us can know how much they mean to him. Even if they are really short, they mean the world. Can't think of anything to write? I've found a couple of great ideas:
a scripture or quote that you've read recently and fallen in love with