Lyric discussion by Canadian87 

The entire song is about his grandma dying. I think the whole time he's only talking to her but makes reference to his new love. For example, in the chorus:

"But I, I wish you knew her now, She's the better side of me now."

This part is him telling his grandma that he wishes she knew his wife because now his wife is the better side of hiim.

"And I'm doing the best I can, it's what you wanted. " Self explanatory

"And I see it like you were there, And I know just how you'd smile. Mary, you look just like it was 1930 that night."

This part is about his wedding night. He can imagine her being there and smiling because she's happy with his choice of a mate and who he has become and that she would have looked so beautiful at his wedding that it makes him think of 1930 when she was young and how beautiful she would have looked then.

That's my take on the comments people have about it maybe being for two people. The song in my opinion is only for his grandma but with reference to his wife.

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