AbstractChild focus is a central construct within Bowen family systems theory (Bowen theory). A clinical implication is that mental health treatment focusing on a child may unwittingly reinforce the operation of child‐focused processes, which undermine rather than enhance child well‐being. The concept of child focus in Bowen theory presents significant implications for professionals working in school settings and in fields such as children's mental health, which are inherently child‐focused. Bowen theory is the guiding theoretical framework for School‐Based Filial Therapy (SBFT). SBFT is a play therapy intervention that was initially established in remote and outer‐regional New South Wales, Australia in response to the low availability of children's mental health services and the significant barriers associated with caregiver engagement in children's mental health treatment. It involves trained school personnel facilitating therapeutic play sessions with children experiencing emotional–behavioural problems. The intervention occurs on school grounds, during school hours, and children's family members do not participate in the intervention. This mixed‐methods study examines the impact of children's participation in SBFT upon family functioning. Interviews with caregivers (n = 10) of children who participated in 10 SBFT sessions were analysed using content analysis. Quantitative data were collected using the Differentiation of Self Inventory – Short Form and Visual Analogue Scale – Family Functioning. A Wilcoxon signed rank test was used to analyse the pre‐ and post‐data. Qualitative outcomes indicated changes in the categories of child functioning, caregiver functioning, and extended family functioning, whilst child‐focused processes remained dominant but changed in intensity and valence following SBFT.