From Wiktionary, the free dictionary
From intra- + family.
intrafamily (not comparable)
- Occurring within a family
2009 February 4, Charles Isherwood, “A New Look at an Old Farm Threatened by Heat”, in New York Times[1]:"Desire Under the Elms" at the Goodman theater in Chicago features […] a stepmother and stepson caught up in an intrafamily triangle.