People ask me this all the time, and I just can't figure out why they don't get it.
Every Monday morning, the Mister transfers Paloma's carseat out of his van, which we take to Church every Sunday, to my van, which really just sits in the garage all week. For some reason, last Monday he brought the carseat into the family room instead of placing it into my car. I was a bit annoyed at first, until I saw Paloma's reaction. She thought having the carseat in the house was the coolest thing ever. She loved to strap, unstrap and restrap herself, all day long. She spent hours in that thing, and as long as we kept a continual supply of books, snacks and water coming her way, she was set.
I'm thinking that if we continued to do this everyday, it might be blurring the lines of some law, somewhere. Funny how it was never mentioned in any home school manual I ever read. Rest assured, the carseat returned to its rightful location shortly after naptime that day.