The subject of how a mother’s mental health impacts her children’s development has been thoroughly investigated, but fewer studies have focused on whether a father’s mental health problems impact his children’s psychological well-being. According to a new study, children whose fathers have psychiatric conditions like major depression, drug or alcohol addiction, or post-traumatic stress disorder are at increased risk of developing mental health problems themselves. Furthermore, it appears that boys are particularly vulnerable to the effects of a father’s mental illness.