This work aims to highlight the relevance of Stephenson's Q methodology (QM) for improving the assessment of child-father attachment relationships. We argue that reconceptualising the relationship can enhance the validity of assessment techniques and help in identifying the paternal behaviours that predict a secure child-father attachment pattern. To this end, we first review the inconclusive and sometimes contradictory findings about links among paternal behaviours, child-father security of attachment, and socio-emotional well-being. Second, the methodological challenges in assessing child-father interactions and relationships are outlined. Finally, with the help of empirical evidence, theoretical perspectives, and observational data gathered from child-father interactions, we substantiate the use of QM in conceptualising and assessing child-father attachment relationships. (Contains 1 figure.)