I trying to find out the rooms which contain a family. Why my dyn is not work?
try like this:
Check your Lacing on the Elents in Room node since you have Lists of different length. Maybe try cross product.
I think there is an easier way to get the right family and then run it by a list of rooms like so:
I found a small bug in the the Elements in Room node, and fixed it so make sure to get the latest package: