Background Parental influences on children's eating and physical activity (PA) and consequently on their weight are fundamental. The present study aimed to identify the predominant correlates of childhood overweight/obesity among a variety of parental practices and children's lifestyle indices in a large sample of children in Europe. Methods Families from low socio‐economic status regions were recruited through schools, located in six European countries (Belgium, Finland, Greece, Spain, Bulgaria and Hungary). Seven thousand three hundred ninety‐seven children 4–12 years old and their parents were selected using the FINDRISC‐questionnaire. Parental practices assessed included parental role modelling, permissiveness and reward. Children's dietary intake and lifestyle behaviours were assessed through parent‐reported questionnaires. Results Regarding parental practices, it was revealed that being sometimes (odds ratio OR = 1.26; 95% confidence interval CI = 1.10–1.43) or rarely (OR = 1.43; 95% CI = 1.21–1.69) physically active with the child was associated with greater overweight/obesity risk, whereas rare permission of computer/mobile/tablet (OR = 0.81; 95% CI = 0.67–0.98) and sometimes (OR = 0.77; 95% CI = 0.68–0.88) or rare (OR = 0.77; 95% CI = 0.66–0.91) reward with PA were associated with lower risk. Regarding children's lifestyle factors, consuming > 3 cups/week fresh fruit juices (OR = 1.28; 95% CI = 1.13–1.45), skipping breakfast (OR = 1.37; 95% CI = 1.17–1.61), absence of 1 h of daily PA (OR = 1.40; 95% CI = 1.24–1.58) and increased daily screen time (ST) (OR = 1.23; 95% CI = 1.09–1.39) were associated with greater overweight/obesity risk. All the variables were adjusted for maternal education, child's sex and age. Conclusions These findings emphasize the necessity of family‐centered approaches in health promotion and obesity prevention programs for children. Such programs should focus on parents as the primary role models in exerting positive influence and encouraging healthy eating habits, PA, and ST behaviors in their children, which in turn, may have a substantial impact on children's overall weight status. The adoption of a physically active lifestyle with the child, with limited screen‐time permission, rare reward with physical activity and healthy eating habits are associated with lower childhood overweight/obesity risk. Future health actions could be orchestrated aiming to counteract childhood overweight/obesity by involving parents as an integral component of any obesity program. Key points Being physically active with the child is associated with reduced obesity risk Omission of breakfast and high fresh fruit juices consumption may increase childhood obesity risk Parental control on children's screen time is linked with lower childhood obesity risk