Most of the extant literature on the fertility history and social networks of older adults has focused on advanced societies. Nevertheless, a limited number of studies have explored how culturally preferred family structures or living arrangements are related to older adults’ social networks in developing societies. This study examined these issues in the Chinese context and paid particular attention to the filial piety and preference for sons dominating Chinese society. Using nationally representative data of adults aged 60 and over from China Longitudinal Aging Social Survey in 2016, we constructed family and friend network scores following previous studies and developed linear models using multiple imputation for the missing data. The results suggested that childless older adults were the most disadvantaged in receiving support from family networks. Despite China's patrilineal culture, daughters were important sources of support. In terms of friend networks, older men who had no sons were least likely to receive support while co-residing with a partner and a son(s) might benefit them. Further analysis revealed that older rural women, but not older urban women, also had more support from friend networks if living with sons, implying urban–rural differences. Given the impact of social networks on older adults’ health and wellbeing, older Chinese people with no sons might need more support from other sources, such as aged-care programmes from public institutions, to achieve healthy ageing.