This study examined support, stress, and well-being between adults who provide care for an aging and disabled parent and those who care for an aging and disabled parent-in-law. The study utilized a sample of individuals caring for a parent (n = 77), individuals caring for an in-law (n = 26) and a comparison group of noncaregivers (n = 1,939) from the Midlife Development in the United States study. In-law caregivers provided more financial assistance but adult child caregivers provided more emotional support and unpaid work. Adult child caregivers reported poorer mental health and family strain; in-law caregivers reported more spouse support and less family strain.