Parents, unpaid caregivers of adults, and parent-caregivers (persons in both roles) had significantly worse mental health than adults not in these roles, including five times the odds of any adverse mental health symptoms.
Czeisler, M. E., et al. (2021). Mental Health Among Parents of Children Aged <18 Years and Unpaid Caregivers of Adults During the COVID-19 Pandemic - United States, December 2020 and February-March 2021. Morbidity and Mortality Weekly Report, 70(24): 879-887. https://www.cdc.gov/mmwr/volumes/70/wr/mm7024a3.htm?s_cid=mm7024a3_w