On 20 March 2026 the Court of Appeal in Re J (Loss of Parental Responsibility) [2026] EWCA Civ 344 handed down its judgment on the question of parental responsibility for unmarried fathers acquired via birth certificates marking a significant clarification in the law relating to parental responsibility, which had been the subject of conflicting authority.
The court considered whether a man who is mistakenly registered on a birth certificate as a child’s father and later shown through DNA testing not to be biologically related to the child ever acquires parental responsibility and if so, whether that parental responsibility can or should be removed.
The court’s decision was clear and far-reaching, in such circumstances the man never acquired parental responsibility at all.
Background
The appeals in Re J (heard together with Re M and Re P) arose in situations where unmarried men had originally been named on children’s birth certificates as fathers, thereby appearing to acquire parental responsibility under section 4(1)(a) of the Children Act 1989. Subsequent evidence, typically DNA testing, established that these men were not the biological fathers of the children whose birth certificates they had been named on.
This raised two fundamental questions:
- Whether registration on the birth certificate alone conferred parental responsibility?
- Whether biological parentage was also necessary?
If parental responsibility was conferred by being named on the birth certificate alone, could it later be removed by a declaration of non-parentage.
Decision
The court held that an unmarried man who is not the biological father of a child does not acquire parental responsibility through being named on the birth certificate.
In such circumstances, parental responsibility never existed and a declaration of non-parentage does not remove parental responsibility: rather it confirms that no parental responsibility was ever held.
In Re P which involved identical twins neither could prove that they are the child’s biological father and so neither could have parental responsibility by virtue of being named on the child’s birth certificate.
This is a decisive rejection of the argument that parental responsibility arises automatically upon being named on a birth certificate and continues unless and until a court orders its removal.
A key aspect of the judgment is the interpretation of the word “father” in section 4 of the Children Act 1989. The court concluded that, in this statutory context, “father” refers to a biological father, not merely a man treated as such through registration or social role.
The court acknowledged that many men function as social fathers forming meaningful parental relationships with children and raising them. Nonetheless, the court held that social or psychological parenting cannot substitute for biological fatherhood when determining parental responsibility under section 4.
While the law has increasingly recognised diverse forms of parenthood—particularly in cases involving assisted reproduction —the court drew a firm distinction here that in these cases biological connection remains determinative.
Implications
The implications of the decision are substantial. The ruling clarifies that parental responsibility depends on biological parentage, preventing reliance on administrative error or human mistake. As such if an unmarried father is registered as a child’s father and there is any doubt about biological parenthood DNA testing will be required to establish parental responsibility.
This may result in men who have acted as fathers to children who it is subsequently established are not biologically theirs may suddenly find themselves without parental responsibility despite years of involvement in a child’s life. In such cases their legal position and parental responsibility must be re-established through other court proceedings introducing potential delay, cost and uncertainty.
This may also cause issues with international abduction where having parental responsibility offers a level of legal protection. In such cases it is important to have the DNA test first and/or put in place clear measures to establish parental rights through a Prohibited Steps Order or Child Arrangements Order in advance.
The court was aware of the potential implications of its decision. It recognised the emotional and practical disruption that may follow, particularly for fathers and children who have known no other father figure. However, it emphasised that such concerns could not override the statute and any extension of parental responsibility to non-biological, non-legal fathers via registration would require legislative reform, not judicial innovation.
Conclusion
Re J establishes a strict rule: parental responsibility under section 4 of the Children Act 1989 is contingent upon biological fatherhood. A mistaken entry on a birth certificate cannot create parental responsibility that the statute does not support. The Court of Appeal has drawn a sharp line between being a father ‘in fact’ and being a father ‘in law’, with parental responsibility firmly anchored in the latter.
These cases highlight the complexity of legal issues that can arise in relation to legal parentage, birth registration, parental responsibility, DNA testing and the care and bringing of children and the necessity of specialist family law advice in such circumstances.
