In a previous article, we discussed an important judgement from the Constitutional Court regarding the rights of donor children. In said article, we already referred to a groundbreaking judgement by the Court of first instance of West-Vlaanderen, section Bruges from June 23, 2023. Through this judgement, our firm obtained an order requiring the presumed donor of a donor child to undergo DNA testing, subject to a penalty payment. A recent article in the Journal of Family Law titled “Mirror, mirror on the wall, who will put an end to donor anonymity in the land?” also refers to this judgement. The Paternity Center also published an official statement in which they advocate for the abolishment of donor anonymity, referring to, inter alia, the judgement of June 23, 2023. Given this renewed focus on the rights of donor children, we will further elaborate on the judgement of June 2023 in this article.

A groundbreaking judgment obtained by our firm
A child conceived through anonymous sperm donation and in-vitro fertilization discovers at a certain age that her legal father is not her biological father. She therefore seeks clarity about her biological paternity on her father’s side, without wanting to break the bond with her legal father.
The donor child then embarks on a years-long search: she conducts genetic research, including registering her DNA in various online DNA databases (e.g., My Heritage and Ancestry). This research led to a probable match. This person was contacted but refused any cooperation to establish the paternity link to the donor child, fearing the impact on his own private life.
The donor child was therefore required to initiate legal proceedings.
The court ruled in her favor and ordered the presumed donor to undergo DNA testing, subject to a penalty payment. This is a precedent in Belgium.
In the reasoning of its judgement, the Court did not make an overnight decision. A balance of interests had to be made between the donor child’s right to paternity information on the one hand and the donor’s rights to privacy and physical integrity on the other.
The Court considered the following elements presented by our firm:
In this case, the Court acknowledges that the donor child’s right to paternity information takes precedence over the donor’s right to keep his biological paternity hidden. This indicates that donor anonymity, which is still legally enshrined in Belgium, is under increasing pressure. Considering the suspicious behavior of the presumed donor during the proceedings, the Court thus ruled that he was obliged to undergo DNA testing.
The Court rightly concludes its judgement with the philosophical reflection that there are no winners or losers in this case. The donor child certainly did not expect that her mere existence would pose a threat to her presumed biological father, nor could she have anticipated that her search would lead to legal proceedings.
A donor, even if anonymity was promised at the time, must face reality and understand that a donor child has the right to the biological truth. The court has (thankfully) acknowledged this.
If you have any questions regarding this topic, please do not hesitate to contact our specialists at info@be.Andersen.com or +32 (0)2 747 40 07.
I am looking for a specialist in

05.10.2026
•NEWS FROM THE FIRM
We are pleased to announce that Luc Herve's law firm has joined Andersen in Belgium, which opened a new office in Liège in September. Luc Herve joins Andersen as a Partner, bringing more than thirty years of experience in tax law, alongside his academic work and role as an accredited mediator. He is joined by Jérémy Lerusse, Associate. Both are members of the Liège Bar.

01.10.2026
•Real Estate, Renting and Co-ownership, Andersen in Belgium
On 21 September 2026, the Royal Decree of 20 July 2026 approving the new Code of Ethics of the Professional Institute of Real Estate Agents (BIV) was published in the Belgian Official Gazette. The new Code enters into force on 1 October 2026, the date on which the 2018 regulations are repealed.

29.09.2026
•Urban Planning and Environmental Law, Andersen in Belgium
A developer who contributes financially to the drafting of a spatial implementation plan may thereby jeopardize their integrated environmental permit. This follows a ruling by the Council for Permit Disputes dated September 17, 2026. The ruling addresses a practice that is widespread throughout Flanders.

17.09.2026
•Urban Planning and Environmental Law, Andersen in Belgium
Non-governmental organisations dedicated to protecting human health will soon be able, like environmental protection organisations, to qualify as part of the “public concerned” in urban and/or environmental permitting procedures. This will broaden the range of organisations that may challenge a permitting decision, adding a new dimension to future permitting procedures.