I have been dating my girlfriend for the last year and a half, but recently my widowed father has been dating her mother. They are talking about getting married, but that would mean that my girlfriend would become my step sister! How do we deal with this? We were dating before all this started, but I don't want people to get strange ideas. My father and her mother are so happy now after being single for so long, and I do not want to ruin their happines, but I also do not want to lose my girlfriend.
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