My sister needs a song to dance to with her son on his wedding day?

Through the Years- Kenny Rogers

Surely your sister and her son have a close enough relationship that they can figure this out between them without input from total strangers. In general, I am of the opinion that the song should fit their relationship. If a teary-eyed "My little man all grow'd up" smaltzy thing would be weird for them, then they should dance to something upbeat from his mother's generation. Start with the popular ballads or doo-woppy things from the year she graduated from high school and come up with something they both like.

Or they could do a classic that's older than that: Beatles, etc.

Bette Midler, Wind Beneath My Wings. A beautiful choice.

You might want to check on this link:

http://weddingsupersource.com/the-top-100-best-wed...

But I think the most appropriate would be, Wind Beneath My Wings

try looking here http://www.weddingwire.com/wedding-songs/