This article examines the effects of transitions in family structure on physical health, thoughts of suicide, mental health, relational well-being, & employment situation of adolescents from four family structures: stable intact families, conflict intact families, single-parent families, & stepfamilies. Results show that transition in family structure after marital problems, divorce, & remarriage does appear to have significant long-term effects on a number of adolescent well-being variables. (21 refs)