There is a growing interest in the topic of children’s subjective well-being and trying to understand the factors that affect it. A number of research studies in the UK and elsewhere have found evidence of associations between children’s subjective well-being and both (a) the quality of their family relationships and (b) their experiences of being bullied. However, most of this analysis uses cross-sectional data and so has not explored how these factors may be associated over time. The presentation will outline new findings on this topic based on latent growth curve analysis and fixed effects regressions making use of the longitudinal nature of the Understanding Society data. Findings suggest, for example, that children who are bullied have persistently lower subjective well-being across this age range and there are also some important gender differences in these patterns. The presentation will also discuss some important learning identified as part of the analysis about the use of the subjective well-being measures and will consider future directions for longitudinal research on the factors associated with variations in children’s subjective well-being.