Increasing frailty or a medical crisis threatens older people’s autonomy. Further threats may arise from adult children if such changes or events are perceived as permitting or signalling a need to assume greater control over their parent’s life. In the context of reablement—a time-limited intervention seeking to help older people regain their confidence and ability to live as independently as possible—this is observed in cases where adult children resist, or seek to sabotage, reablement. This runs counter to the notion of family being a valuable resource and partner to reablement services in achieving the desired outcomes. Notions of autonomy and legitimate authority, which often co-occur in care relationships, provide a useful lens to understand this phenomenon. The aims of this study were to explore reablement staff’s accounts of the ways adult children seek to assume control over their parents’ reablement, and how they manage such situations. We undertook a secondary analysis of a qualitative dataset comprising transcripts of 11 focus groups with staff (n = 78) in five reablement services in England and Wales conducted for the purposes of a study investigating the factors affecting older people’s engagement with reablement. Staff’s accounts included descriptions of the different ways adult children can seek to exert control over the reablement process. Staff believed that, when aware this was happening, older people ceded control to their child(ren) because preserving the relationship with their child(ren) was a greater priority than maximising their independence. Staff’s descriptions of the different strategies they used to protect family relationships whilst supporting the older person’s autonomy shed light on the skills reablement staff require. Findings support person-centred approaches to reablement which understand and respond to the wider family context. They also point to possible limitations or gaps in workforce training and supervision.