I have no doubt that they LOVE being wth you guys too! They are total lovers, so they are content with anyone that will give them love and attention, which is what you and your family has done for them!
I think once they all realize this is a forever deal and not just a visit, they will be learning to co-exist.
I am sure there is a battle for dominance going on between all of them. Boomer and Karma had their relationship pretty well worked out, but it took them a long time too!
Tell me: is Boomer biting too (!!) or just doing that crazy loud squealing bark?