In this study, the process of ability formation from childhood to adulthood was examined using a sociometric approach. Honda (2005) indicated that family communication during childhood is the most significant predictor of the formation of abilities such as motivation, social skills, temperament, and others. A hypothetical model on the process of ability formation was innovated on the basis of theoretical or empirical literature. The model was tested using data gathered from 1,078 Japanese male working professionals aged 25-35 years. The Structural Equation Modeling (SEM) clearly showed that family communication does not have a very strong direct influence on ability formation as compared with the economic condition of the household and the transition process from family communication to non-family communication during childhood. This result illustrated that there are other ways through which we can boost human ability, apart from promoting family communication during childhood. Finally, a means of both mitigating the inequality in human ability formation and cooling down the "level of family education commitment" discourse was suggested.