Introduction: Childhood obesity becomes a major concern and tremendous implications for future health care. The current increase of prevalence of childhood obesity is a result of mainly hypernutrition and reductions in physical activity. Therefore familial environment is an important target of childhood obesity interventions. However, few studies have examined effects of parental obesity and physical activity on childhood obesity. Therefore, in this study, we investigated the association between parental obesity and childhood obesity from age 2 through age 18 in Korean children. Methods: Data from the Korean National Health and Nutrition Examination Survey IV (Korean NHNES VI) conducted between 2013 and 2015 were analyzed. From all of subjects, 4,066 children whose ages are between 2 and 18 years were included in this study population. In these surveys, anthropometric measurement and a questionnaire about health-related lifestyle, included usual physical activity and food intake frequency were conducted. Their parents were also asked to report same values and checked anthropometric measurements. Results: The prevalence of obese and overweight in Korean children was 6.7% (M=F, 6.7%) and 10.9% (M, 11.3%; F, 10.4%), respectively. The mean body mass index (BMI) of both parents was higher in obese and overweight children than in normal children. Pearson correlation between parent and child’s BMI standard deviation score (SDS) were 0.230 for father-son pairs, 0.287 for mother-son pairs, 0.229 for father-daughter pairs, and 0.309 for mother-daughter pairs. Odds ratio analyses found sons were 2.5 (95% confidence interval (CI): 2.3-2.7) times more likely to be obese if their father was obese, 3.4 (95% CI: 3.1-3.6) times more likely if their mother was obese. In the case of a daughter, odds ratio for obese was 2.4 (95% CI: 2.2-2.7) if their father was obese, while that was 2.8 (95% CI: 2.6-3.0) if their mother was obese. The amount of usual intake was statistically correlated with both parents. In addition, walking habits of parents affect their children’s obesity. Conclusions: The resemblance between parent BMI and children’s BMI SDS was statistically significant, but not strong. However, parental obesity status is associated with children’s obesity status. In addition, parents’ eating habits and walking habits can affect their children’s obesity status.