We used linear regression analyses to examine the associations between parental externalizing polygenic score and adolescent externalizing polygenic score in predicting adolescent externalizing behavior. We also used linear regression models to test the associations between parental externalizing polygenic score and adolescent externalizing polygenic score in predicting parental externalizing and parenting measures (i.e., parental involvement, parent-child communication, parent-child closeness, and parental knowledge). Analyses were conducted separately for each parenting measure. Covariates included adolescent age and sex. These association analyses were conducted in Mplus version 8.3 (Muthén & Muthén, 1998–2017) with the CLUSTER command, which accounts for the nesting of individuals within families.
