Day 336: Having a rational argument with a 3 yr old

Yesterday, I saw my nepson (sorta of nephew, sort of son, actually neither I would call him my male best friend). We were perfectly matching. I had on an orange dress with a tan sweater and he was wearing a tan, orange, and blue polo. (I got the picture, it's cute). We went for dinner but only ended up getting ice cream. (I do this regularly....and I'm sure he has great metabolism.)
When it was time for him to leave it went something like this:

Nepson's mom: Ok, honey time to go.
Nepson: No, mommy, I want to go with Tia* (he calls me Tia, spanish for Auntie)
Me: You can't go with me, I don't have a carseat.
Nepson: Mommy has a carseat, you can use hers.
Me: Ha, but I have nothing to put the carseat, Tia doesn't have her car.
Nepson: Does Aunt Val have her car? (smug look or maybe regular toddler look whatever)
Me: (stumped)
People next to us: Laughing hysterically, well you got told!

Sadly this was not our first argument of the night.

Nepson: Can I have some of your ice cream?
Me: Sure, sit right here. Just don't eat my strawberries.
Nepson goes for a strawberry and I knock it out of his spoon. While I pick up the strawberry and gloat, he anxiously fills his spoon over and over with ice cream, while I'm struggling to finish the strawberry (and finish gloating). Nepson gets another strawberry and three big bites before I realize what is going on.
Me: WHO'S ICE CREAM IS THIS ANYWAYS?
People next to us laugh hysterically, we all know the answer.

It was his from the time he picked up the spoon.