C.P.
I think this is such a lovely idea!
Here's a thought: Are the Bride and Groom going to be lighting a candle together?
Perhaps you could carry your candles up and the Groom's mommas light "his" candle, and the Bride's mommas light hers.
Then the Bride and Groom will light the big candle with the candles you mommas lit. :-) Such a nice analogy, really...you mommas bring your children life and raise them to adulthood, and then they come together as one.