Well, isn't that just lovely? You can simply call your sister's husband by his first name, or if you feel close enough, you can use a nickname or term of endearment that feels comfortable for both of you. Remember, it's all about creating a warm and welcoming atmosphere in your family.
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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. :)
by his real name. Sometimes men get freaked out when you call him a nickname. But if he starts calling you honey bunny or something, think of a name for him. ask a trusted friend