This study examines the effects of cramming school on family members's human capital spill-over. An individual's human capitals are accumulated from family, school, informal school, and job, but fewer studies investigated the effects of informal schools, which may occupy most of young's growth time. In this study, we use the data of the generations in 1953 to 1964 and 1964 to 1976 from Taiwan Panel Study of Family Dynamics to examine the effects by categorizing their industries, occupations, and sectors. The empirical results show that the cramming school decreased the spill-over effects in family. It implies the social mobility of lower education family would be increased with the popularized cramming schools.