Both are boy cars, according to Daniel. (Don't try to explain that "The Queen" should be a girl... it's a useless argument and a pure waste of your energy.)
We listen to a lot of music in both cars, but each has a different song selection. And Daniel is becoming a connoisseur of music, declaring (loudly) "I like this song!" every time one of his favorites comes on. Which is about every other songs. Some days, he claims them: "This is my song. I like it."
In related news: We also have dance parties in the car. Frequently.
Often we race getting the kids into their car seats. It's fun for us and keeps the kiddos entertained instead of squirming to get out. No matter who wins, Daniel inevitably solves the conflict: "How 'bout we BOTH won!"
And it seems that being strapped into car seats forces some fun interactions between the kids too - it's harder to be mean when you can't even touch your sister. In car seat mode, Daniel's a little parent to her: He makes her ask nicely for things (which toy she wants to hold). He shares well with her (probably because we are 1.5 feet away and watching). He often holds her hand just for fun or to comfort her.
And my favorite is this: He has begun translating for her. "Mommy, Violet says she wants agua." "Daddy, Violet and I are hungry." "Mommy, Violet wants to get out of her car seat." "Daddy, we love you - Violet and I love you."
I already have so many fond memories of us, as a family of four, in the car together.