Not really.
I always heard it as:
“Incest! A game the whole family can play!”
“The family that lays together stays together.”
[sub]I am NOT for a second implying an incestuous/hillbilly reference wrt to Mylie & Co. It’s just an expression I heard that fits the trend in this thread. Personally, I don’t have any problem with the Cyrus paradigm, whatever it is.
As long as they don’t.[/sub]
Is it wrong to want to punch a 16-year-old female in the face very, very hard?
Well, it sounds like she may be used to having something “very hard” in her face.
Spanking is a lot more fun 
Insipid wee bitch needs to shut the fuck up about Radiohead.
If you can’t keep it in your pants, at least keep it in your family?
Of COURSE it is, sometimes…
Did you have a specific question here, or were you just looking for the masses to be ignorant enough to generalise sufficiently?
I can only quote from The Gentleman’s Alphabet Book by Harvey Kornberg and Donald Hall:
Not really applicable to this situation, but still a limerick about incest…so, there’s that, anyway…
In Peru we have the saying “Con la prima hasta que gima” (Do you cousin till she moans)