Complicated group, what is going to be the goal, as you have APs and know the park inside out, but not Christmas . The others haven't been to DLP at all? How many days do you have?
Íf it was just you and your partner I would say to focus on all the entertainment. There are 2 repeats this year from other seasons: The Starlit Princess Waltz and Surprise, Mickey. Have you seen these shows and think your party might be interested in these?
I would definitely go to see Mickey's Christmas Big Band and the Christmas Parade. Depending on the interests of the girls, take them to meet Santa.
It will be a completely different trip when you are with a group intead of two The pace will be slower, and with kids you will need a plan for either child swap the rides they are not tall enough for, or skip rides. With characters, if the girls haven't been before, keep in mind kids can be scared or shy around characters.