Hero- mariah carey
whenever you remember- mariah carey
ill stand by you- pretenders
my wish- rascal flatts
Oh, when I read the question I thought it was like a "southern brother/sister" wedding. I was going to say "anything by Georgia Satellites" but now that I read it I will say anything by Donnie and Marie would work.
You've Got a Friend-James Taylor
I'll Stand by You - Pretenders
Wind Beneath My Wings - Bette Midler (a little overdone)
You and Me Against the World - Helen Reddy (cut out the Mommy parts in the beginning and end)
These are all pretty sappy but you might like one
Sometime you cant make it on your own - U2
There is a light that never goes out - The Smiths
Just the way you are - Billy Joel
Waiting on a Friend - The Rolling Stones
"In My Life" by the Beatles. The lyrics are a warm sentiment that don't come across icky.
If you happen to be from Southern USA, I would suggest "Dueling Banjos."