Background/Objective: In child custody disputes, one of the remit of the forensic psychologist is to evaluate parental attributes while suspecting defensiveness. The instrument of choice for undertaking this double task is the MMPI. Method: As to establish the state of the art on this, a meta-analysis was undertaken with a total of 32 primary studies from which 256 effect sizes were assessed. A meta-analysis was undertaken, effect sizes were corrected for sampling error and criterion unreliability. Results: The results revealed a positive, significant, large and generalizable mean true effect size for the L, K, S and MP scales, and the L + K and L + K-F indexes. The Wsd was positive, significant and large, but not generalizable. A negative and significant, but not generalizable mean true effect size was found for the F and generalizable for F–K index. The effect sizes for the L, K, S and MP scales, and the L + K and L + K-F indexes were equal. Both the gender of parents (father vs. mother) and the context of evaluation (parent child custody disputes vs. parenting capacity) were assessed as moderators. Conclusions: The results are discussed in relation to forensic practice.

Parental attribute evaluation in relation to child custody comprises psychological and psychopathology. Additionally, defensiveness must be suspected on this setting. The worldwide reference psychometric measurement instrument for this purpose is the MMPI. With the aim of knowing the responses of parents litigating by child custody, a meta-analytic review of the responses to clinical and restructured scales was performed. A total of 21 primary studies (studies with a simulation design i.e., participants were instructed to answer as parents litigating by child custody were found were disregarded) were found, obtaining 291 effect sizes for clinical scales and 1 for restructured scales. The results showed positive, significant and generalizable mean true effect size in the Hy, Pd and Pa scales; a negative, significant and generalizable in the Ma and Si scales, and non-generalizable in the Pt y Sc scales; and a trivial mean true effect size in the Hs and D scales. Parent gender was studied as a moderator having no found differences between the responses of mothers and fathers. The implications of the results for forensic evaluation practices are discussed.