I found this on the interwebs: http://chandoo.org/wp/2014/02/13/dynamic-cascading-dropdowns-that-reset/
However, the method that was used to achieve the cascading seems unnecessarily more complicated/laborious than the method that I used in the attached example. As such, chandoo's refresh macro won't work.
I was wondering if a similar macro could be coded to accomplish a the refresh effect on my attached example when children do not match parents. If it's too complicated or not possible with how I achieved the cascading let me know and I'll follow Chandoo's tutorial from start to finish.