Yesterday, my mom, the kids and I dropped off my dad at the airport. After that, we took Miles and Vivienne (and Evelyn, though she wasn't conscious for most of it) to Observation Park at RDU. They have an elevated lookout area where you can watch the planes land and takeoff on one of the runways. They pipe in the air traffic control as well, which is really interesting. Miles and Vivi really enjoyed watching the planes, but Miles was particularly excited. Grandma held him up each time a plane took off or landed and he would tell us over and over that it was a "Pane! Pane!"
When we got back to my mom's house, we put the kids down for a nap. She has 2 pack n plays side by side for the kids. We put Vivienne in the left one and Miles in the right one. Then I laid down with Evie to take a nap myself and Mom was on the couch on her computer. After about 30 minutes, we heard the kids playing upstairs. Mom went up to investigate and, much to her surprise, Vivienne was in the right-hand pack n play and Miles was in the left! They had switched pack n plays! She watched them for a little while, and she saw Viv do a somersault over the edge into the other pack n play.
I guess they can no longer be contained. Next time we're at her house for naps, I think we're going to try to separate the pack n plays and see if the kids still try to escape (hoping that it's not as tempting if you can't simply somersault into your sibling's bed). We'll see.