My sister chose "I am your child" by Barry Manilow for her mother/son dance at my nephew's wedding.
I am your child
Wherever you go, you take me, too
Whatever I know, I learn from you
Whatever I do, you taught me to do
I am your child
And I am your chance
Whatever will come, will come from me
Tomorrow is won, by winning me
Whatever I am, you taught me to be
I am your hope,
I am your chance,
I am your child
Whatever I am, you taught me to be
I am your hope,
I am your chance,
I am your child
It is a slower style song, but not too long at all.