Thankful thoughts

The other day a beautiful thing happen, my little boy was thrilled with idea to hold his little sister in his lap!:-)
For the first time! :)

I'm so thankful for having this two little stinkers and I'm so thankful for the moments like this :-) I love them so much, I love seeing how they grow affection for each other. DuoSis became fond of her brother I think as soon as she was born. It's enough to hear his voice and she is like spelled, looking at him all the times...
On the other hand, that is not the case with this little boy. He loves her alright, but she has to be on some distance and don't bother him at all. So I appreciate these moments where he shows how he really feels about her.

What are your experiences with siblings love? Any advice?