The Court of Appeal has handed down its judgement in Re J (Loss of Parental Responsibility) 2026 EWCA Civ 344, a decision concerned with how family law defines a “father” and when parental responsibility (PR) is acquired.
What is Parental Responsibility?
Parental responsibility is the legal authority and duty to make important decisions about a child’s upbringing, including their education, healthcare, and welfare. It gives a parent (or other holder) the right to be involved in key aspects of the child’s life and ensures they are responsible for the child’s care and wellbeing.
Background: When biology and social parenting conflict
In Re J, the appellant was registered as the child’s father at birth and went on to raise the child for the first two years of their life. It was only after the parents separated that DNA testing revealed he was not the biological father. With the biological father absent from both the child’s life and the proceedings, the appellant argued that despite the DNA result, his registration on the birth certificate gave him PR, which could only be removed through a welfare-based assessment. The High Court disagreed, finding that he never actually acquired PR.
These three conjoined appeals (including Re J) all turned on the same core question:
What are the legal consequences when someone registered as a child’s father but later found not to be the biological parent?
In Re J and Re M, the men had stepped into the role of psychological and social fathers, believing that being named on the birth certificate meant they shared PR with the mother.
The third appeal had unique facts in that the father being a twin, both twins having had sex with the mother within the same week it could not be determined who was (or was not) the biological father.
What the Court of Appeal Decided
The Court of Appeal delivered a lengthy and significant judgement. The key points are stark:
- Under the Children Act 1989, “father” means biological father only.
- Being named on a birth certificate does not confer PR if the individual is not the biological father.
- To acquire PR via registration under s4 CA 1989, a man must be both the biological father and named on the birth certificate.
- In Re P, DNA testing showed each identical twin had a 50% likelihood of being the biological father, and therefore because testing could not distinguish between them, neither could meet the biological requirement for PR.
This ruling whilst it brings clarity, brings consequences.
What this means in Practice
A man named on a birth certificate may not have PR if later DNA disproves paternity, meaning that DNA testing may become essential where paternity is uncertain or disputed.
Social or psychological fathers are still recognised in welfare assessments but, they must apply for Child Arrangements Orders (s8 CA 1989), Parental Responsibility Orders (s12 CA 1989).
This has practical implications for safeguarding, particularly for schools and healthcare providers who must ensure they are taking instructions from someone with legal PR.
A defining moment for parental responsibility
Re J, Re M, and Re P clarify a longstanding grey area in the law.
While the decision reinforces the legal importance of biology in acquiring PR, it also highlights the need to protect the role of non-biological fathers who play a meaningful part in a child’s life.
If this decision leaves you with questions about your rights or your relationship with a child, please contact our Family team.
This is only intended to be a summary and not specific legal advice.
