And I will make of thee a great nation, and I will bless thee, and make thy name great; and thou shalt be a blessing: And I will bless them that bless thee, and curse him that curseth thee: and in thee shall all families of the earth be blessed. (Genesis 12:2-3)
All the families of the earth shall be blessed. This is the extent of the gospel and the direction of history.
Family (Heb. bayiṯ “house,” mišpāḥâ; Gk. oíkos). The basic social unit, comprised of persons related by kinship and sharing a common residence. The Israelite family was an extended family known as the “father’s house” or “household” (Heb. bêṯ-˒āḇ), consisting of two or more nuclear families (i.e., a married couple and their children) or composite families (an individual with multiple spouses and their offspring). It was both patrilineal and patrilocal, headed by the father or patriarch and consisting of his wife (or wives), married sons and their wives, unmarried children, and grandchildren—all of whom shared the patriarchal residence; other kin (including grandparents), servants, concubines, and sojourners might also be reckoned part of the household (cf. Gen. 46:5–7, 26). The patriarch was the oldest living male, at whose death authority passed to the eldest son and property was divided among all sons. (Eerdmans Bible Dictionary)