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That's enough flirting with Frey's sister, Young God!

"She's Ron's sister, Harry told himself firmly. Ron's sister. She's out of bounds. He would not risk his friendship with Ron for anything."
Harry Potter, who, of course, ends up married to her anyway.

"I wanna put my tubesteak into your sister. What'll you take in trade?"
Private Joker, Full Metal Jacket

"You wanna fuck my sister?"
"Yes."
"You wanna fuck my sister!?"
"Yes."
"..."
"$26.50."
"Deal."
Stephen Lynch, The Best Friends Song

Charlie is attracted to Alice, and she shares his feelings. Unfortunately, Alice is Bob's sister, and Bob and Charlie are the closest of friends. As such, Charlie feels it's wrong for him to date Alice, no matter how much he wants to.

A major Truth In Television trope, as most any guy can tell you. If you've known someone for more than 24 hours, his sister is off limits. Forever. Some reasons behind this are:
  1. Whenever Charlie sees Alice, he can only think of Bob.
  2. If Charlie and Alice do break up, his friendship with Bob may be over as well.
  3. Bob is actually okay with it, but has delivered an If You Ever Do Anything To Hurt Her speech, and Charlie doesn't want to take that risk.
  4. As the quotes above indicate, Charlie and Bob may have a history of being, shall we say, "less than respectful" of their... "conquests" and Bob doesn't want his sister getting the same treatment.

This may also be a symptom of a character having a Big Brother Complex or Big Brother Instinct, if Bob is angry at Charlie for dating Alice, but Bob and Alice aren't actually related, or are just friends.

Could lead to a Knight Templar Big Brother.

Note that while the title says 'sister', this includes mothers, brothers, cousins, aunts, uncles, grandmas, grandpas and so forth. Except dads, because Overprotective Dad already covers that.

Not to be confused with Brother Sister Incest.


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