The above definitions are correct, but I'll also add that brousinhood can occur without some weird babymaking with two women who are also siblings. Another instance of brousinhood is when a family adopts their niece or nephew, later having kids of their own, making the adopted child and the newborn baby both brothers and cousins.
Stranger: Eminem, are your kids sisters or cousins?
Eminem: Well I adopted one from my ex-wife's sister, so I guess that makes them brousins...
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