Unmarried Fathers and Parental Responsibility: Court of Appeal Ruling Explained

This year the Court of Appeal handed down judgment in a landmark parentage and parental responsibility case, ruling that a person wrongly named as a child’s father on a birth certificate who is not married to the birth mother does not automatically gain parental responsibility if they are not the child’s biological father.

Legal Meaning of “Father” and Key Ruling

In an important judgment dealing with three conjoined family law appeals, senior judges said the legal meaning of “father” under the Children Act 1989 is limited to a child’s biological or genetic father unless Parliament has specifically provided otherwise.

The ruling means that a person does not acquire parental responsibility if they are not married to the mother and are not the biological father of the child, even where they genuinely believed they were the child’s father, were named on the birth certificate, and helped raise the child.

However, the court also stressed that this does not mean non-biological fathers can never obtain parental responsibility. The judgment only applies to the automatic right that normally arises when a biological father is registered on a child’s birth certificate.

Judges said non-biological parents who play an important role in a child’s life may still obtain parental responsibility through other legal routes, including child arrangements, parental responsibility, or adoption orders made by the family courts. The court referred to the role of “psychological” or “social” parents and made clear that such relationships can still receive legal recognition.

The Three Appeals and What They Show

The appeals involved three very different family disputes, all raising questions about parental responsibility and legal fatherhood.

In the first case, a man believed he was the father of a child born in 2020 and was registered on the birth certificate. Two years later, after the parents’ relationship had ended, DNA testing showed another man was the biological father. Despite continuing to see himself as the child’s parent and seeking to remain involved in the child’s life, the Court of Appeal ruled he had never legally acquired parental responsibility through birth registration.

The second case involved a couple who had conceived a child using donor sperm purchased online rather than through a licensed fertility clinic. The man was named on the child’s birth certificate and acted as the child’s father, but DNA testing later confirmed he was not biologically related to the child. Again, the court held that he had not obtained parental responsibility automatically through birth registration alone.

The third case involved an unusual dispute between identical twin brothers. DNA evidence showed that one of the twins was the biological father of a child, but science could not determine which twin it was. One twin had been named on the birth certificate, but the court ruled that neither man could prove paternity on the balance of probabilities.

Key Legal Principles and Practical Implications

Giving the leading judgment, Sir Andrew McFarlane, President of the Family Division, said a person only acquires parental responsibility automatically through birth registration if two conditions are met: they must be the child’s biological father and they must be registered as the father on the birth certificate.
The court rejected arguments that parental responsibility continued unless formally removed by a court order called a “declaration of non-parentage”. Instead, the judges concluded that where a person was not the biological father, parental responsibility “never arose in the first place”.

The judgment means DNA testing will be required to establish parental responsibility if there is any dispute as to the biological link between an unmarried father and a child. If paternity is not established, individuals who have acted as fathers since birth may find they are unable to make decisions regarding the child despite years of involvement in that role.

If they seek to be recognised in law as the child’s father, they will need to make the necessary applications to Court to establish parental responsibility, which may not be automatically successful and may involve costs.

The judgment also highlighted concerns about a possible “abduction gap” in international child cases. The court noted that a person who wrongly believed they had parental responsibility might later discover they did not have the legal rights needed to challenge a child being taken abroad. If there is any doubt as to paternity, parents should consider having DNA tests first and/or securing their position through a Child Arrangements or other order.

Case: Re J, Re M and Re P [2026] EWCA Civ 344
Court: Court of Appeal (Civil Division)
Judges: Sir Andrew McFarlane, Lady Justice King and Lord Justice Stuart-Smith
Date: 20 March 2026

Why This Judgment Matters

This judgment highlights how complex parental responsibility can be, particularly where questions arise about biological parentage or legal status. These issues often arise in the context of wider family proceedings and can have a significant impact on an individual’s ability to be involved in a child’s life.

If you are involved in proceedings concerning a child and are unsure about your legal position or rights, it is important to seek legal advice at an early stage so that you fully understand the options available to you.

Our public family law team has extensive experience in matters involving parental responsibility, child arrangements, and disputes about parentage, and regularly acts in complex cases of this nature.

About the Author

Sorcha qualified into the Employment Department at Machins in 2018 before moving into public family law, where she now represents parents in care proceedings and supports Children’s Panel work. She is known for her warm, supportive approach alongside robust advocacy when required. Sorcha provides clear, pragmatic advice and is committed to supporting clients through challenging and sensitive situations.