In this work we study the intergenerational transmission of human capital in Brazil. We evaluate the effect of both mother and father`s education, measured as years of schooling, on their children`s school performance. Using data from 1988 and 1996 PNADs we find strong non-linearities in our OLS estimates, as well as different effects on boys and girls. We then isolate pure causal effect of parent´s schooling on their offpring´s by using historical series of schools and theachers as instruments for parent´s education in our 2SLS-IV strategy. The results show strong evidence of a direct causal effect of parent´s schooling on their children´s, though our strategy is unable to separate mother´s and father´s effects properly