This study explored the impact of family socioeconomic status on the parent-child relationship, the mediating role of children’s Internet use, and the moderating role of grade. A total of 450 pupils (mean age 9.69years, SD = 1.23) in grades 3 through 6 completed the Parent-Child Relationship Questionnaire, Children’s Network Questionnaire and Family Affluence Scale. The results showed: (1) family economic status, Internet use and parent-child relationship were significantly inter-correlated; (2) family socioeconomic status positively predicte...