[AddieandMiaMom]

I don't know if you can do this now that they've both been in the house, but when we got Dany, before we took them in, we gave them a little walk so they were together in neutral territory. When we got home, Dany entered the house before Addie and Mia so Addie and Mia didn't feel the need to defend their territory. You might be able to try it, take them out for a drive, get home and do that. We didn't really have jealousy problems.

I put Addie first for everything. She's always been first, she's the "alpha dog" and this keeps the peace. When Mia and Dany are coming at me for attention along with Addie, I make sure to always pet Addie, but switch off for Mia and Dany. Wish I had three arms!