Not sure if this would have anything to do with the situation or not. But, I know that if I am around someone I don't care for I will lay around like a lazy bum just because I lack the enthusiasm it would take to get up and entertain them. Kinda the same situation if you have to do some mundane task at work... hard to get motivated. The Pilek kids came off to me as being just like that. I bet if Katie's mom had been there, she would have been all over the place. However, the Bower's kids liked Sam and were willing to do just about anything for her, hence their level of motivation was to please Sam. Just my two cents.