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The Messenger of Allah (s.a.w.s.) has given great emphasis on taking into consideration a good family background when we intend to marry.
He said, “Marry in the lap of a decent family, since the semen and the genes have effect.”ref
The Holy Prophet (s.a.w.s.) also said, “Look very carefully and minutely as to where you are placing your child because genes and hereditary qualities are transferred in a concealed and unintentional way and have their effect.”ref