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When an adult parent is diagnosed with a mental health disorder, whether acute or chronic, the disorder engenders—at different levels—psychosocial consequences (professional, social and economic situation, couple and family relationship), as well as temporary or definitive deficits in his/her parental role. Taken together, these factors are liable to affect both the parent-child relationship and child development (psychomotor, social-affective, and cognitive), both in the short and long term. Besides, the impact of parental mental disorder on the parent’s sensibility and responsiveness to the child’s needs may expose the child to a high risk of deprivation, neglect, and maltreatment. Drawing on our clinical experience and research work in this field, we will focus on the impact of chronic parental mental disorders, such as psychotic and personality disorders, on the parent-child relationship and on child development.