The term I am familiar with prior to that was "immediate family" (as opposed to "extended family"). You come across the term a lot in old genealogy books. For

The term I am familiar with prior to that was "immediate family" (as opposed to "extended family"). You come across the term a lot in old genealogy books. For instance in "The History and Genealogy of the Prentice, Or Prentiss Family" (from 1883) contains: > All his immediate family, himself, wives, and children, are dead. https://www.google.com/books/edition/The_History_and_Genealogy_of_the_Prentic/0EJfQJUmarMC?hl=en&gbpv=1&dq=%22immediate+family%22&pg=PA83&printsec=frontcover https://www.google.com/books/edition/The_History_and_Genealo...