You may want to follow up the following pieces of research:
Texas Adoption Study (Loehlin et al 1997)
Loehlin, Lindzey, and Spuhler (1975)- Race differences in intelligence
Wait, so it's not even that you are claiming that only smart people have smart kids, it's that certain races have smarter children?
here is the wiki page about that book:
http://en.wikipedia.org/wiki/Race_Differences_in_Intelligence"The majority of the data points were based upon convenience rather than representative samples. Some points were not even based on residents of the country. For instance, the “data point” for Suriname was based on tests given to Surinamese who had migrated to the Netherlands, and the “data point” for Ethiopia was based on the IQ scores of a highly selected group that had emigrated to Israel and, for cultural and historical reasons, was hardly representative of the Ethiopian population. The data point for Mexico was based upon a weighted averaging of the results of a study of “Native American and Mestizo children in southern Mexico” with result of a study of residents of Argentina. Upon reading the original reference, we found that the “data point” that Lynn and Vanhanen used for the lowest IQ estimate, Equatorial Guinea, was actually the mean IQ of a group of Spanish children in a home for the developmentally disabled in Spain. Corrections were applied to adjust for differences in IQ across cohorts (the “Flynn” effect), on the assumption that the same correction could be applied internationally, without regard to the cultural or economic development level of the country involved. While there appears to be rather little evidence on cohort effect upon IQ across the developing countries, one study in Kenya (Daley, Whaley, Sigman, Espinosa, & Neumann, 2003[14]) shows a substantially larger cohort effect than is reported for developed countries."