I never updated this! I went with Angel Standing By for the dance with my mom. She held it together the whole wedding, but then at the mother-son dance, cried the whole time. Definitely a memorable moment and it was the right choice for me! Thank you everyone for the great suggestions!
In case you're curious, my husband and I danced to Tim Halperin's cover of "Always Be My Baby." Then my mom and I danced to Angel Standing By. Then I had the DJ play some of the Bee Gees/Celine Dion song, Immortality for my mom and dad to dance to. Lastly, the DJ played Dance with My Father by Luther Vandross for my dad and sister to dance to (she had eloped and he never got to dance with her). Then everyone joined in during that song.