When ever they see each other they start flailing their limbs and squealing until they get to hug. At one point I was working in the kitchen and they went a good 20 minutes playing together in the living room before I had to intercede.
Here they are in the bathtub. I can't put either of them in with Keely or Max because they get mad about the splashing. But Ben and Aviva both love it, so it was like a wet and wild water park in that bathroom. Sort of.
At one point they were both screaming at me not matter what I did. I finally put them both in high chairs and gave them food. That was better, but they were still pretty mad. It wasn't until I positioned their chairs like this so that they could have company that they were both happy.