I have three females(all 3 spayed), two that are the same age (3 years) get along, but the other female(5 years) does not. We have two packs, the older female and oldest male in one pack and all the rest( two females/two males) in another. As much as I would love to have them all happily living together without restrictions…..I can not. We tried very hard to keep them together, but way to many dog fights, mostly the older female and the other alpha female from the younger pack. The size difference in the dogs made it such a mismatch we couldn't continue to let the smaller dog take that kind of punishment and we got bit ourselves trying to break them up.
Please be careful with whatever you do, we don't have small children and if I did I'd have to think long and hard about my childs safety vrs wanting multiple dogs. We separate and every now and then things still happen, mostly through our error, but the danger still is there.