Setting family parameter using another family

I am working with a revit add on that uses families to make walls. With this I am looking to have have the width of the wall be used to change the width of an angle that is to be mounted on the same wall. I am not sure what flow of commands I would use to change the the parameter. Finding the parameter I am looking to use right now is select model element for the source family and element get parameter value by name with a string calling out the wanted parameter. From there I am not sure how to finish the rest of the dynamo work flow.