I don't even like it when a parent just walks in at pickup and I have said so to several with the idea that it is uncomfortable for the children to not have any warning - leaving me out of it. But the parent response was sorry thought this was a daycare. I had to remind them that at a daycare centre they walk into the building and are directed to the child's classroom they dont' just barge into the classroom unannounced. So my classroom is my entire house - knock and wait for an invite please.