When we moved we only had Sammy. He was so traumatized watching all of his familiar things leave the apartment that I thought he would go crazy. I think he thought we were going to leave him behind. Once we put him in the carrier and in the car he was as calm as he could be. I think he was just glad to know that he was going to.
If I were to move today I would do things different. I would take things that were theirs like beds, toys, blankets, food bowls, and litter boxes to the house first. I would put them with all of their familiar things in a room until the move was done. I would constantly go reassure them. I hope I never have to do it again but if I do that is my plan.
Good luck!!