I just saw a movie that involved this and it’s got my mind a-working.
Let’s say you have a younger sister. She’s the “old maid” in the family–never talking about a love interest or bringing anyone over for dinner. Her spinsterhood is always the 800-lb gorilla in the room. There are even rumors that she’s a big ole lesbian.
One day she reveals to you that she actually has a man. A man who just happens to be ya’lls first cousin.
She assures you there are no worries about children because she got a hysterectomy. Plus, they don’t want to have kids anyway. They plan to elope any day now. She just can’t wait!
You want to be happy, but you know something she doesn’t. Years ago, an aunt told you that her son–the cousin in question–is actually your half-brother due to some fatherly “stepping out”. Further snooping on your part confirmed that this is true. You haven’t told anyone what you know because you promised you wouldn’t.
You’re plenty skeeved out by the idea of cousins being together, so siblings getting it on totally freaks you out. And yet you see how happy your sister is. You know that this revelation would wreck her chances for happiness.
So. Do you tell the sister what you know or just keep your big horsey mouth shut?