Salutations!
I am working on a small project with the action taking place in the Family Document environment. In short, I am trying to see if a FamilyParameter is in use. As far as I can tell, this information is not available from the FamilyParameter object or the FamilyManager itself.
We can be certain that this information exists somehow, as when you try to remove Family Parameter which is being used, Revit will prompt this warning dialog:
I also tried a workaround where I remove the parameter from the API, but then I don't get the warning message at all. I am not sure if I can intersept that somehow, maybe then I will know if the parameter is in use or not.
I'd appreciate any help 
Thanks!