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Your sisters husband would be your Brother-In-Law, depending on whether you are a male or female, you would be his brother-in-law or sister-in-law. What he calls you well, that depends on your name and how much he likes you. I have a brother-in-law named Jerry, what I call him I can't say on here because well, this is a family sight. :)

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16y ago

What else can I help you with?