Yes, I absolutely do! However, it doesn't usually bother me all that much. During the week, it totally depends on if I have room that day or not. I usually ask them to bring some extra food if their child(ren) will be here during a meal. On the weekends it depends on what we have planned as a family - plus, my "true" friends will watch our kids on the weekends occasionally too, so it's reciprical (sp?).
If you're feeling taken advantage of though, just say no. It's okay to say that sometimes! (I'm still convincing myself of that too!)
