My heart goes out to you,
@Ruminator. I lost my dad to lung cancer 2 days before his 60th birthday. To this day, I feel that I got cheated out of 20 years with my best friend. As the saying goes, life's not fair.
Your comment about not imaging a scenario how you and your brother wouldn't make it to your 80's is very prophetic IMO. Either one of us could walk across the street and get struck and killed by a car in the next few moments. It's a reminder to always be kind, especially to those whom we love, because you never know. You don't always get a chance to say goodbye.
Hang in there, bro.