Currently, there are a lot of nagging little things. Dinner is never right (thus whining and fussy about what's served and why are we having it again).
If DD9 starts whining, we first ask her, "Are you whining?" as a warning. If she continues, she gets to deposit a dollar in DW's whine jar. DW always acts enthusiastically about receiving the money, and talks about how she could
really use it.
If he doesn't want to do something (ex. learn to put on soccer apparel, go to bed to sleep/put the book away), it's a battle. Nothing is ever as simple as having it done when one asks.
Failure to go to bed on time means DD's bedtime moves earlier the next day. We haven't had the issue with books, but when putting away toys became an issue, we started collecting all of the the loose toys and putting them in the garage.
I was hoping there was something (besides his parents) that might talk to the point of there being benefits to going along with what one is asked to do by one's parents.
Basically, we demonstrated to DD that we, as parents, are the wellspring of all the wonderful privileges she enjoys, and going along with our reasonable requests ensures continued enjoyment of said privileges. If she has any questions, we'll be happy to address them, though not necessarily at that particular moment, because there may be a need for urgency or discretion.