Hmmm...I guess I hadn't thought about it being an effort for them to get attention *from each other.* I'll think about that some more.

I'm trying to work on helping them talk to each other. I don't feel like they converse much, maybe because there tend to be landmines (someone will attack/correct/take issue with someone else). They either play, which, oddly, they play much more harmoniously than they talk, or they fight. I would love to see them TALK.