My mother-in-law is a devout Catholic. Oftentimes when we call in the evening, Grandpa will tell Tanner & Morgan that grandma is "at church".
On the way home from the grocery store on Sunday, we drove by a church. Here's how the conversation went from there:
Morgan: Mommy, that's a church, Jesus lives in Church!
Mommy: Yes, dear.
Tanner: No, Mor-dan. Grandma lives in church.