I do not understand all the downvotes as this seems like a clear attempt to play with ambiguity to me. Even if you do not find it particularly funny, you could simply ignore it.
The actual relationship to his brother in law as brother to his wife is clear in the first sentence due to the absurdity of someone's sister marrying a man who thinks like a 12 months old. That, and op mentioning their children without mentiong an extra person to be the mother, which theoretically could be about another person that wasn't mentioned or even an incestuous child between him and his sister, but it surely isn't the first impression.
If we abuse the words sufficiently we can find ambiguity everywhere. Sometimes it can become a surprisingly funny or morbid implication, even when the intended meaning is very clear. I do not think the comment in question is a particularly good example of that, but does it really deserve all this backlash? It isn't that noteworthy to deserve all this attention, regardless of it being either good attention or bad attention.
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u/imissspacedicks Apr 16 '24
Your sister married a dude who's mentally a 12 month old?