Very nice post honoring your grandfather @thedarkhorse ...
"... reminded him many times that our success started with his hard work, ethics, morals, and that good genetics clearly helped too."
... and, hopefully, he is still of sound enough mind to recognize that.
My wife works with these people and a sad reality which she shares with me regularly is both that people reaching this stage of their life are no longer of sound mind and, worse, there is no one around who expresses any concern about it.
God bless you and your family, as your grandfather lives out the final chapter of his life.