In the Injun book it say
When first brave married squaw
He gave out a heap big "Ugh!"
When he saw his mother in law
"The only enemies at a wedding, Klump, are the in-laws."
— King K. Rool, Donkey Kong Country
"When are you going to learn that In-Laws are your natural enemies?"
— Dan, Dan Vs.
''A man from the Ansar said, "Allah's Apostle! What about Al-Hamu the in-laws of the wife?" The Prophet replied "The in-laws of the wife are death itself."
— Sahih Bukhari, book 62
"Like a mother-in-law in a bad sitcom..."
— Kaname Chidori (regarding Commander Mardukeus), Full Metal Panic? Fumoffu
"If you have got to outlaw anything, you should outlaw in-laws, too."
— Morris, Fiorello!, "Marie's Law"
"For my part, my main Lovecraft and Conan periods came in late 2004, early 2005.. In hindsight, the period is more remembered as the lingering tail end of my relationship of the time. Foreshadowing existed in the form of the sheer and bitter acrimony her parents felt towards me. While large parts of my memory, in hindsight, reveal flaws in my actions I was unaware of at the time, this period is unusual in that, in hindsight, her parents were actually crueler, more selfish, and more hateful than I gave them credit for. My capacity for grudges is often more limited than I let on, but they manage the remarkable feat of, even now, over five years since I last had anything to do with them, being among the most miserable and horrible people I have ever interacted with. I actually have more animosity towards them than I do towards my ex-wife. And this animosity stems entirely from the sheer hatred they directed towards me in this period. In hindsight, the staggering black hole of anger they positioned in my life forms a better explanation for my fondness for stories about unspeakable cosmic evil than anything else."