Résumé : This questionnaire-based study compared 36 Israeli lesbian mother families (n = 72 lesbian mothers) formed by donor insemination, 39 Israeli gay father families (n = 78 gay fathers) formed by gestational surrogacy, and 36 Israeli heterosexual parent families (n = 72 heterosexual parents) formed by assisted reproduction (without donated gametes), all with a target child aged 3–10 years. The families were examined for parents’ assisted conception socialization self-efficacy, depression, negative and positive affect, life satisfaction, positivity, resilience, social support, and child externalizing problems. Multiple factors associated with child externalizing problems were also examined. Multilevel modeling analyses indicated that parents’ assisted conception socialization self-efficacy did not differ between family groups; however, lesbian mothers and gay fathers reported fewer child externalizing problems and greater social support, relative to heterosexual parents. Also, lesbian mothers—but not gay fathers—reported lower levels of depression, greater life satisfaction, and more positivity than did heterosexual parents. Finally, irrespective of family type, greater assisted conception socialization self-efficacy was associated with fewer parent-reported child externalizing problems. Findings are interpreted in light of the cultural socialization framework and Israel’s familistic and pronatalist environment. Implications for health professionals, educators, and policymakers working with diverse family forms are discussed.