'Descendants' in the Bible

Jonathan told David, “Go in safety, inasmuch as we have sworn to each other in the name of the Lord, saying, ‘The Lord shall be between me and you, and between my descendants and yours forever.’” Then he stood and left, while Jonathan went into the city.

So now swear to me by the Lord that you will not cut off my descendants after me and that you will not destroy my name from my father’s household (extended family).”