Zoning laws may or may not apply, depending on where you live. I would venture to guess that most zoning laws do not cover family members anyway, and this is likely one of those cases where there is a complete disconnect between legal definitions at the Federal and municipal level (i.e., a person may be considered a family member for zoning purposes even if they're not a family member for Federal tax purposes).
Rent control records (if applicable) would not be a problem because this would be the lowest rent anyone ever paid for living space.
As far as the other financial/tax aspects of your post, I say: "Bring it on."
1. I'll calculate the depreciation based on floor area -- to the one-hundredth of a square foot. Sure, I'll recapture and report that as a capital gain when I sell the home ... but I'll be deducting the depreciation on my tax returns in the meantime.
2. While I'm at it, I'll deduct all of the costs of keeping that living space in good working order -- including furniture and a pro-rated share of the utility costs that matches the pro-rated share of the living space that I calculated above for depreciation purposes.
3. And while I'm at it, I'll deduct the cost of groceries for these folks, too -- because that's supposed to be covered by the rent, too.
By the time all is said and done I could be showing quite a sizeable loss on my income tax return, largely by deducting legitimate expenses that would otherwise not be deductible except for the fact that my "family members" are now tenants. You can be sure I'd keep meticulous records of all these things.
So if slavery is defined economically as an effective tax rate of 100%, isn’t any lesser percentage merely a matter of degree?