reliability, with α’s between 0.74 and 0.87 across all age groups (i.e. 6–8 and 9–11 years old) and individual informants (i.e. parents and children). Maternal and paternal reports of conflict were available for 990 and 857 twins, respectively. Child reports of their relationships with their mother and father were available for 985 and 960 twins, respectively. As with CP, the various informant reports were modestly to moderately correlated (r = 0.16–0.32, all p < 0.01). Consistent with prior work (Burt et al. 2003, 2005), the four informant reports were averaged together to create a composite of parent–child conflict.
