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I have this girl we have been dating for the past 18 months now,i knew her mother cos her father is late and the mother is aware of our relationship,but just recently i get to know that we are not compatible as our genotype is thesame (AS). But the fact remain that she said she wants to marry me which i let know that's not just possible.

I am 24 yrs old while she is just 21 yrs old, she let me know that her mom and dad are both of thesame wrong genotype that they scape through that she believes we will do thesame as well.

I just don't know the best way to get her out of my neck as her mother is on her support, fellow nairalanders can you just please help out as your advices are more important to me now.