Take your time and think it through, especially if this impacts your relationship with your fiance. She'll always be there. Letter is good only if you don't need to provide your address or meet with FOB's brother's wife (that's if you don't want to) too often. I'd say open an random hotmail account and ask FOB's mother to write to you there. You'd get to know why she's contacting you faster and if you don't want to hear from her again, you can just shut the email account down and still have it all in writing. Good luck whatever you decide.
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