My grandpa passed away

My grandpa, my Mom's dad, the kids great-granddad passed away.  I believe he was nearing 90.  He was having lots of difficulties, going blind from an infection, lost of appettite, not being able to move around by himself at the end.  Hopefully, he's more at peace now.
It was very hard on my Mom.  The last time I saw him was when I visited Vietnam back in 1996.  The kids don't really understand, they've never met him.