A Miser's Dream routine with a story tailored for children will be a hit with adults as well because they will see some extra skill involved and really be fooled.
Sammy smith has a video of this I think, but you can find it in his book "Big Laughs for Little People"... he calls it "Cash Surprises" with the effect being coins constantly found in the ears of children. Although his variation is a good starting point, you can come up with your own version of the routine. Also, incorporate some neat sleights into the effect. Use what you know well or learn some new sleights that will help make the routine better.