The representatives have no constitutional power to dictate who can live together as a family, and have sworn an oath to support the US Constitution as our supreme law. -- Thus they are restricted in this instance to reasonably regulating zoning issues, health & safety codes, etc.
If people don't like it they can either campaign to replace the council members or move.
Or, -- they can petition for redress against an unconstitutional law. [see the 1st]
This they will do, and win...
Frankly, unless one lives in the community it is none of their business.
Frankly, defending liberty is everyones business.