Is this a regional thing or what? I've read on MDC several times about parents checking if there are guns in the house before allowing their child over at another kids house or a relatives home. I have never ever encountered this in person. I live in the midwest, so perhaps this is just not something people do here. I personally, don't have a problem with the idea of guns in a home so wouldn't ask. Right now my kids go to the homes of people I know to be responsible adults, so if they have guns I'm sure they are appropriately stored. My kids also know that they are never ever to touch a gun without direct adult supervision. So even if they encountered one they'd leave it alone. They have opportunities to shoot and can simply ask if they want to do so and my husband, my father, or I will take them. So the allure of guns as toys or as forbidden things just isn't there.
I've also never ever been asked this question. If asked I would be honest and say that we have a shotgun in the house in a locked case, but don't keep ammo in the house. However, I really can't imagine being asked. It would seem absolutely bizarre.