I can't see how defining what constitutes a "family", and then using that as part of defining some types of buildings, can be construed as a *prohibition* on having more people living together.

Both of those articles assert that such a prohibition had been in place for years but never enforced, and that this past fall a new rule was being proposed that would lead to enforcement, but both articles are very vague about the new proposed rule was. Neither of them actually help me figure out what the supposedly already-existing prohibition actually says. I have so far not been able to find it in the code.