You know, the uke was destined to die at the same age that his first life, and his brother looked like he died in the war at the same age that he off himself in his first life so I think maybe he will die young this time too
If dragon didn't save him uke would have died so I think dead of destiny is out of dragon control, (he can kill if he wants but saving is mor difficult with already dead people, take in count he maybe could have made the princess live longer)
Realistically I don't think the brother will die because I don't think that is the author aim but for continuity sake he should die
Happy baby loving bubbles is so adorable