Hey Hillary,
Follow up question on this ...
This worked great and was able to tweak your example and make it work. My question is how would you reset the child responses to null when the parent question is re-answered to "no". So the user goes in and selects "yes" displaying the child questions and answers them. Then realizes "whoopsie" that should have been "no". When the user goes back and selects "no" how can I wipe out their responses on the now not displayed child questions?
It seems like a variation of this formula on a set field value rule should work but I haven't had any luck.
Appreciate your time!