Personally I wouldn't send anything until you know that you're not just sending it directly into a black hole. Why don't you donate it in his honour to another charity? That would seem more apt in my opinion. There's millions of other charities and people around the world that could do with some help right now and a fair few accept bitcoin directly.
I wouldn't donate it unless there is a way to confirm that any of his relatives have access to the funds. It would be a waste if you donate it while knowing that the funds will be lost.
Guess it's already confirmed
here that his family has access to the donation address.
Confirmed by who? Some random no-name account? I wouldn't believe anything that accounts says without some evidence. People have questioned his legitmacy:
I do not think there is a possibility to be 100% sure that all funds from the donation will finish in the right place. Bruno did not leave here such a possibility, considering that he was prepared for this outcome. He was an experienced person and I personally believe he provided a way for someone from his family to have access to these funds. Likewise with his Bitcointalk accounts.
one of the best scam buster, would not leave it unsafe where they need to write a few words on paper.
Unfortunately, we can't change anything here, we can no longer help him if it was once possible, I'd rather divert money to save someone's life. I saw a few charity initiatives here.
Whatever. OP, I believe in your best intentions but I think this must be your decision or wait for some time, maybe we will hear something from Bruno's account successor.