I think that it is preferable to let each of the two girls to have her own candle lighting ceremony. It is such an important piece of the party, that it is better to let them enjoy a personal memory of it, isn't it so? Anyway, it still would be nice to find a way to somehow share the ceremony in a way. What about lighting the candles alternately, ne candle this girl and the same candle the other girl, one candle after the other. Can be good fun!
