In this study, the researchers investigated whether children are more likely to develop problem gambling (PG) as young adults if their parents had PG during childhood. The researchers looked at data from the Avon Longitudinal Study of Parents and Children (ALSPAC). The researchers found that parental gambling at age 6 was not associated with children’s PG at age 20. However, parental problematic gambling at age 6 predicted children’s PG at age 20. Daughters were more likely to have PG at age 20 if they had fathers with PG when they were children. Sons were more likely to have PG at age 20 if they had mothers with PG when they were children. These findings suggest that gambling problems can be passed from a parent to their child of the opposite gender. Prevention service providers can use this research to create gambling prevention programs for young adults who have reached the legal age of gambling. This group may be at higher risk of developing gambling problems than other age groups.