Unfortunately, my parents both passed. Only his estranged siblings are alive. I am not the oldest, but the youngest. Does this have any bearing on who would inherit his estate?

I think he's been on government disability for the past decade as he's been unable to work but still managed to survive. Doesn't this coupled with him being 67 years old meant he had government assistance? So medical debt may not be an issue.

Honestly, I doubt he had much assets to pay someone to pursue. I just figured if I can donate whatever he has, it's at least one last thing I can do for him to get him some good karma.