I actually have 4 yorkies two females (sisters) and two males (not related) and the biggest female is the leader of the pack (also the instigator) and my smallest male is the "leader of the boys" they are amazing to have! you learn new things with them every day
their favorite thing to do right now is harass my sheltie (shes 12) and she is still getting used to them. They each have their own cushion on the couch but all end up cuddling together when your asleep with them.