They got 4 together all of the same age, 2 Swedish Flower Hens and 2 silver Deathlayers. At first, she said she was worried the SFHs would be mean because they seemed to dominate the Deathlayers. But they've had them about a month now and she said they seem to have really calmed down.
They buy all of their birds at about 13 weeks old so they can get only females and not do the chick thing. I mean, she's almost 90, so chicks would just be a lot of work, lol. Since they get them older, they are more skittish with people than I guess hand raised chicks would be, but they aren't aggressive at all.