The Canadian dollar he brought back from a fishing trip to Canada in the 70's. The US two dollar was in his modest collection too. He passed in 1981.
Those bills are in great condition, but I don't think they are anything special. But they are special to you. Much like the silver dollars my grandfather gave to me, I will never part with them.
The 1954 Canadian dollar has an interesting story to it. I wonder if someone knows what it is without a web search?
Mass pareidolia had so many people seeing a devil's face in the queen's hair that it forced a redesign. Your bill is the modified image.