Multilevel models are proposed to study relational or dyadic data from mult
iple persons in families or other groups. The variable under study is assum
ed to refer to a dyadic relation between individuals in the groups. The pro
posed models are elaborations of the Social Relations Model. The different
roles of father, mother, and child are emphasized in these models. Multilev
el models provide researchers with a method to estimate the variances and c
orrelations of the Social Relations Model and to incorporate the effects of
covariates and test specialized models, even with missing observations.