oh, yes, I've got The Power!!!!!
"When you've tidied your room, it can be your turn to read Harry..."
"Please empty the dishwasher, and then you can read Harry."
"Hey, how about you make your bed and adios those dirty clothes and then you can read Harry..."
"Ok, you have a quick shower while your sister finishes the chapter, and then you can read while she hops in..."
Aha, bargaining chips. I'm loving this... while it lasts!
and then perhaps it can be *my* turn to read Harry?!!