Oliver has adjusted to the babies much better than we had expected. We've been careful not to blame the babies when we can't do something with him because we are caring for them. He's been able to take it in stride that he sometimes has to wait before one of us can help him. Of course, it helps that Pauline & I are both home all day, so his life hasn't been altered quite as much as if I was home alone all by myself. Hopefully, when I go back to work, he continues to be this cooperative for Pauline.
If you asked him, Oliver's biggest complaint about the babies is probably their crying. Of course, he has yet to understand that most often it his noisyness or crying/whinging (mostly in the car) that has woken them up and irritated them in the first place. Pauline & I aren't exactly a fan of three screaming kids in the car either!
Oliver been very gentle and to-date he's only acted out once (hitting Lukas on the foot when he got mad). Oliver frequently asks to hold "dat one" and beams while he is holding one or both of his brothers.
While I had expected Oliver to want us to treat him like a baby, I was surprised that he didn't really want to act that out until this weekend. While Adam & I were feeding the boys, he told us Ricardo (the monkey) was hungry. I made him a bottle and he fed and burped Ricardo while we fed the babies. It wasn't long before he was drinking the bottle and wanted Mommy to feed him like a baby. Afterwards, Oliver's water play included making form-Ula (that's how he pronounces it).