(1) Riley does NOT like to share her pink blankies unless it's her idea. One time I put Jack down on the couch with his head on her blankie... She was NOT amused. But you know what, those are her very special blankies, and she doesn't have to share them, that's okay. So I picked him up off it, problem solved.
(2) She is always trying to put his paci in his mouth (even when he's sleeping), OR she will put it in her own mouth. We're still working on this one...
(3) She will occasionally do something she's not supposed to while I'm feeding him, and not listen to me when I tell her to stop doing what she's doing. I'm still trying to suss out what the best way to respond would be. If I don't respond, then she sees she can get away with it for a while. But she's doing it for attention, so if I do respond (by unlatching the baby, or getting up with him and stopping/reprimanding Riley) then I am giving her the attention. Currently I'm trying to prevent these behaviors in the first place by setting her up with a fun activity to do either by herself or with me on the couch while I feed him. And it usually works.
Anyway, we'll see what happens as they both get older. I want to do everything possible to foster a wonderful relationship between the two of them, and I can't wait to see how they grow together.