[The Glidd]

I play in a few wedding bands so I see a lot of this stuff:

For wedding party introductions:

Blues Brothers Theme is energetic and you can loop it several times for 30 people. We also play a Barry White instrumental, I'm not sure or the name of it. At any rate, nobody will really be listening to the music at this point, it should be background as the MC announces the names of the people from the wedding party. In fact, every wedding I've played has the introductions take place over an instrumental.

For mother son, here are several options:

Song for My Son (complete cheese)
You Raise me Up - Josh Groban
What A Wonderful World - Louis Armstrong

Are probably the most common.