With Milo, we'd probably talk about his little adventures and travel stories as a kid/teenager (he used to travel a lot with his dad and brother, especially since they were home-schooled and went to different places).
With Huey, we'd talk about art, music, our favorite artists.
With Eloise...well, she's 12 and she likes fashion, some girly stuff, video games, and cartoons. She would probably do most of the talking. haha