Czech-English conversation

Today I listened to the conversation between mother & child in the tram. Ok, it is impolite I know, but read more.

First, I ignored everybody in the tram, but than I recognized that the kid next to me is speaking english. The kid was maybe 3 years old and his pronounciation was nice British. I like small children speaking English, because I'm always amazed how they can speak so good ;-)

Suddenly, kids mother said something, and my brain gets crazy .. wait she's speaking Czech! And really, this conversation was more than interesting (and not because of its content) - kid was speaking English and mother Czech!

Part of conversation (under Nuselsky bridge):
Kid: Look mummy theres a bridge!
Mum: Ano je, a jezdí v něm vláček, víš?
Kid: Train? I can't see any train, wait ... (kid is carefully looking at the bridge) Cars! I see cars driving there.
Mum: No vláček jezdí vevnitř.
Kid: Inside? Aha ...