Self‐esteem, school achievement, and friends are important factors in social development. A cohort of 123 Canadian families who had adopted 155 international adoptees during the 1970s participated in a recent research project. ¹ The project tested these areas and then compared their results with 121 Canadian‐born siblings in these adoptive families as well as adolescents and young adults in the general population. These international adoptees fare as well as or better than adolescents and young adults in the general population but not quite as well in some areas as their siblings. Differences were found in some instances between male and female respondents. The authors discuss these findings from a developmental perspective. ¹The authors wish to thank National Welfare Grants, Human Resources Development Canada, for funding this research.