I watched some friends' children for a couple hours one day. Their little girl is 2 1/2 and their boy is almost 9 months.
The girl and Caedmon can be interesting together...they're still learning how to interact with other children and how to share.
And recently, Caedmon has become obsessed with their little one, constantly touching and hugging and driving the poor boy crazy! It's sweet, but I'm constantly worried he'll knock him over and get a little rough with him. Having a baby in the house soon is going to be interesting!