"birth father." YourDictionary, n.d. Web. 07 December 2018. <https://www.yourdictionary.com/birth-father>.
birth father. (n.d.). Retrieved December 07th, 2018, from https://www.yourdictionary.com/birth-father
(plural birth fathers)
By extension from birth mother
also birthfather (bûrth′fä′thər)
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