I'm expecting no.3 (a boy) in August. By then, my daughter will be 6 and a half, and my son 4 (or just about 4). We've been lucky with the dynamics between my two oldest kids. Their relationship is mostly good and they get along well (except when the word MINE enters the conversation...).
I wonder how they dynamics will change with a third one added to the mix. (Of course, it completely depends on the personality of number 3, but you can wonder).
How did the introduction of a 3rd child change your family dynamics? I'd love to know how other people experienced it.