The phrase "unaffected siblings" refers to brothers and sisters who do not have a particular condition or problem that other family members may have. Full definition
Among these asymmetries: spontaneous causal CNVs were found in 8 % of the affected children in the sample; this is four times their rate of occurrence in unaffected siblings. (cshl.edu)
The researchers studied facial emotion recognition in 107 teenagers, divided into three groups: 39 healthy control subjects, 44 adolescents diagnosed with conduct disorder, and 24 unaffected siblings with a brother or sister who has conduct disorder but who have no history of antisocial behavior themselves. (sciencedaily.com)
Impaired insulin signaling in unaffected siblings and patients with first - episode psychosis Chouinard VA, Henderson DC, Dalla Man C, Valeri L, Gray BE, Ryan KP, Cypess AM, Cobelli C, Cohen BM, Öngür D. Molecular Psychiatry. (mcleanhospital.org)