Siblings...

Recently I had to take my kids to the Emergency Room. It wasn't an "emergency" but our pediatrician is in the tornado "affected area" so we went to a very small, local hospital. We received adequate care for our needs that day. While the doctor was examining the kids he remarked "I bet they fight all the time." I responded to him that they get along pretty well most days.
I have been thinking about his comment since I left. Corban and Ellie really do get along quite well. They greet each other with smiles and laughter after being separated--if only for a nap. She follows him like a lost puppy and he most often encourages this!
I'm not saying that every day is perfect--it isn't. They each want the same toy or need to be reminded not to push and hit. But I hope that we can continue to encourage them to be close and loving siblings. I think that as parents it is up to us to help foster closeness between our kids. We can do a lot to help this or to deter this.
Do you have any tips or suggestions for me? I would love to hear them!