biosib

plural biosibs

1. A biological sibling.

   She has to deal with sharing her mom with kids who aren’t even her biosibs.

   2011, Liane Shaw, Fostergirls, Second Story Press, →ISBN, page 149

   2 more examples

   Adjust their _ identity, _ power, _ loyalties, and _ “rank” in their _ home/s and _ stepfamily each time _ their co-parents have a new child (i.e. a half-sib); or _ a biosib or stepsib moves in or out of their home; or _ a key person dies, moves away, re/marries, or re/divorces.

   2002, Peter K. Gerlach, Build a Co-parenting Team: After Divorce or Re/marriage (volume 6 of the Stepfamily inFormation Series), Xlibris, →ISBN

   The logic behind this argument is the same as the logic of behavioral genetics, in which comparisons are made between MZ and DZ twins and biosibs and adopted siblings.[…]For example, the equal-environments assumption (EEA) is unlikely to apply to orphans and non-orphans, just as it is unlikely to apply to MZ and DZ twins or to biosibs and adopted siblings.

   2012, Michael Beenstock, “Empirical Knowledge on the Causes of Correlations within the Family”, in Heredity, Family, and Inequality: A Critique of Social Sciences, Cambridge, Mass.; London: The MIT Press, →ISBN, page 248

   Synonyms: biosibling