pseudosibling
nounEtymology From pseudo- + sibling.
1
One who is not a sibling but has a relationship of that kind.
- […] the girls were older than average when they entered the family and thus did not develop the usual pseudosibling relationship […]1982, David P. Barash, Sociobiology and behavior:
- With multiple stepparents, stepsiblings, half siblings and pseudosiblings, it’s a whole new type of family, and with it comes the challenge to design a home where everyone feels welcome.2007 April 19, Kate Murphy, “Stepfamilies Try to Stretch Their Space”, in New York Times: