According to Pregnancy Day By Day, family history is an important part of fraternal twins, especially on the maternal side. The woman may carry a gene that allows her to release more than one egg at a time when she ovulates. Interestingly enough the paternal side maybe important too, if the genes are passed through fathers to their daughters.
Bibliography
MD, Amato, Paula, and Maggie Blott, MB, MS, eds. Pregnancy Day By Day. 1st ed. New York: DK, 2009. Print.
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