Major depression and other serious mental health concerns appear to follow parental or sibling death for many child and adolescent survivors. While grief and depression remain a central focus in bereavement research, the impact of sibling and parental death on personality development remains incompletely understood. This study focused on coarser personality adaptations that may occur in response to childhood or adolescent grief. Analysis was conducted on a crowdsourced survey sample (N = 2,398) which included respondents with parent (n = 143) or sibling (n = 102) death prior to age of 17. Parental death was associated with Callousness and Hostility as personality dimensions. Sibling death was linked to higher Callousness, Hostility, Physical Aggression, Depressivity, and Hypomanic trait scores. Callousness elevations (>1 SD) were more common among respondents classified in the sibling and parental bereavement groups (ORs of 3.02 & 2.17, respectively). Significant differences were found after control of variance associated with respondent age and childhood adversity exposure count. Parent and sibling suicide exclusions reduced trait differences between the bereaved and nonbereaved respondents. Sibling death was associated with more trait differences and larger effect sizes than parental loss. Questions remain regarding the nature of the psychological conditions that differentiate normative, resilient, and callous personality adaptations in the aftermath of early family tragedy. The prognostic value of the DSM-5-TR traumatic bereavement specifier was discussed.
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