Then he told his other grandma that God doesn't exist...

Our six-month stay in the U.S. is over, but we're not quite home yet. On our way back to Switzerland we're spending a few days with my husband's family in Holland. (My husband is French, but his mom is originally from Holland, and she's moved back to Holland to be near her siblings.)

I don't even know how the subject came up. I was reading a book (I know: bad, anti-social me...) when I hear my husband explain, "It's like 'God'." (I'm translating)
Mother-in-Law: Oh, you've talked to him about that?
Nico's dad: It came up during the trip.
MiL: (to Nico) You see, Nico, some people believe that God exists, and some people believe that God doesn't exist.
Nico: OK, well, I'm one of the people who thinks God doesn't exist.
MiL: That's OK, but your grandma believes that God exists.
Nico: OK.

And that was the end of it. As I explained earlier, we haven't really discussed the subject with our kids, but I imagine we will once we get back home. Leo hasn't shown any interest in the question -- too busy building things out of Legos.