Don't know if it's exactly what y'all are looking for, but "When you and I were young, Maggie" in ANY of its versions is the sweetest, most sentimental song I know. If you would rather something sentimental but up-tempo I would suggest "Dance to your Daddy" as a fast (but loving) song.

"When thou art a man, free to take a wife, thou shall find a maiden, love her all thy life. She shall be thy lassie, thou shall be her man, dance to your daddy my little man."

Mike