I have one video showing how they are starting to play, so check out the videos.
It is obvious that they are much more aware of each other visually. They are interested in each other. The play will continue and increase over time. For now they are still sleeping a great deal. Sleep helps them grow.
A couple of them are getting particularly good at trying this walking stuff. That too will continue till they are up walking all over. They have to be steady on their feet to feed them food. That usually occurs about 6 to 7 days from now. This crew will eat first and then the Raven crew.