The Aim: Evidence shows that, along with other variables, the parenting environment contributes significantly to the educational attainment gap. Whilst 'face-to-face' parenting programmes have been shown to be effective, very few studies have examined online models of delivery. Questions to be addressed, therefore, include establishing if widely available online courses enhance parent-child relationships and provide a foundation for learning. The present study examines the efficacy of an 11 module online course about children aged 0-18 years based on the Solihull Approach theoretical model. Method: A between subjects, repeated measures design was used. The scores of 115 self-referred parents/carers were compared before and after completing Understanding Your Child -- Online (UYC-OL) between 2013-2015 on the Child-Parent Relationship Scale (CPRS). Paired samples t-tests were performed and Cohen's d was used to determine effect sizes. Results: Highly statistically significant improvements were found. Closeness within the parent-child relationship significantly increased (p=<0.0001); whilst conflict significantly decreased (p=<0.0001). Effect sizes were large (d=0.61 and 0.78 respectively). Limitations: The study provides preliminary evidence only. Demographic information, multiple measures and comparison groups were sacrificed in favour of accessibility and participant engagement. Conclusion: The Solihull Approach online course appears to offer an effective option for enhancing universal parent-child relationships. The implication is that it should be included in population based strategies for increasing resilience, reducing the impact of adverse childhood experiences (ACEs) and closing the attainment gap.