This presentation reported on the familiarity of suicide ideation in subjects who participated in the Cardiff Depression Study, namely, 108 depressed probands, their nearest aged siblings, & 105 healthy control subjects & their siblings. 66% of depressed subjects experienced suicidal ideation in the week prior to interview; this ideation was significantly associated with recurrent illness. Suicidal ideation was not shown to be familial. Surprisingly, 6% of the healthy, never depressed subjects admitted to transient suicidal thoughts.