Very touching Russell, very sad, thanks for sharing.
I can see a resemblance.
I lost my older brother, Jeff, just over 10 years ago, he was almost 56 years old, too young, hard for Mum & Dad at the time, and his children. Jeff's death was sudden, no long-term physical illness or condition, but he had struggled with drugs from his early 20's, and that's what got him in the end.
Doesn't matter how or why they're gone, they're gone.