I wish there was some magical way to get your kids to do what you want them to, kind of like Ella Enchanted (they just have to obey no matter what). Obviously that is not the case and the one thing that I found that works and I am not afraid to use is Bribery!
They have to make their beds, put all their school stuff away when they come home, finish homework, practice piano, feed the animals and do the dinner dishes every day for one entire week in order to earn one of these chocolaty yummilicious goodies (all that for 1 candy bar? shhh, don't let them know that they could get paid minimum wage for all that). Really and truly these don't sound too great to me right now, but when I am not pregnant I LOVE chocolate. Poor Bria lost hers the first week, for telling a fib, but quickly recovered the next week. So, I am going to continue doing this for a little while longer until I have to find something else to dangle before the horse's mouth! So, yes I would highly recommend finding your child's Achilles Heel and exploiting it!