stepfamilyn.
/ˈstɛpˌfam(ᵻ)li/, /ˈstɛpˌfaml̩i/, U.S. /ˈstɛpˌfæm(ə)li/ A family with one or more stepchildren; a family in which at least one of the adult partners has children from a previous relationship or marriage (though not necessarily living in the same household); (also) members of such a family.
ΚΠ
1873 Atlantic Monthly Mar. 358 His name is Brandon, and many pages further on we find Dorothea staying with his family and his step-family, Lon, Liz, and Valentine.
1912 Jrnl. Royal Anthropol. Inst. 42 189 If the widow has no grown-up family, nor step-family, nor brothers-in-law, she can marry and bring her husband to the house.
1964 A. W. Simon Stepchild in Family xiv. 221 The step family, product of the new concept of marriage, pioneers its morality against tremendous odds.
1984 Sunday Tel. 7 Oct. 14/2 The stepfamily is fraught with the fundamental conflict between establishing a cosy new family..and the obvious need of children to keep in touch with the excluded parent.
1997 Guardian 23 Apr. (Society section) 9/1 A growing number of children now have to manage a relationship with two stepfamilies, including, potentially, stepsiblings and half-siblings plus two sets of step grandparents, aunts, uncles and cousins.
This is a new entry (OED Third Edition, September 2002; most recently modified version published online March 2018).
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n.1873