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Last updated: April 8, 2026

Quick Answer: Yes, you can marry your cousin in Germany. German law does not prohibit marriage between cousins. However, there are specific regulations and considerations, particularly concerning potential genetic risks for offspring, which may lead to further consultations or assessments.

Key Facts

Marriage between first cousins is legally permissible in Germany.
There are no explicit legal restrictions preventing consanguineous marriages.
While legally allowed, couples with a high risk of genetic disorders in offspring may be advised to undergo genetic counseling.
The primary concern is the potential for increased recessive genetic disorders, not a legal prohibition.
German inheritance laws do not differentiate based on the degree of cousin relationship in marriage.

Overview

In Germany, the question of whether one can marry their cousin is a matter of legal permissibility rather than outright prohibition. Unlike some other jurisdictions that may have restrictions on consanguineous marriages, German law takes a more liberal approach. The focus tends to be less on the act of marriage itself and more on the potential implications for any future children.

This legal stance reflects a broader European trend that generally allows for cousin marriages. However, it's crucial to understand that while legally sound, such unions are often accompanied by considerations related to genetic health. The potential for an increased risk of certain genetic disorders in offspring is a factor that medical professionals and, in some cases, legal authorities might bring to the attention of prospective couples.

How It Works

Legal Framework: The German Civil Code (Bürgerliches Gesetzbuch - BGB) outlines the requirements for marriage. Article 1307 states that a marriage is void if one of the parties is already married or if they are relatives in a direct line of descent (parents, children, grandparents, grandchildren). Crucially, it does not extend this prohibition to collateral relatives like cousins. Therefore, legally, marriage between first cousins is permitted without any specific restrictions based on their familial relation.
Absence of Prohibitory Clauses: Unlike some countries that explicitly forbid marriage between individuals within certain degrees of kinship, Germany's legal framework does not contain such specific prohibitions for cousin marriages. The emphasis is on personal autonomy and the voluntary union of two consenting adults, provided they meet the general legal requirements for marriage, such as age and mental capacity.
Genetic Considerations: While legally permissible, the possibility of an increased risk of recessive genetic disorders in offspring born to closely related parents is a well-established biological fact. Recessive genes, which carry the potential for certain conditions, are more likely to be present in two copies (and thus expressed) when both parents share a significant portion of their genetic material. This increased probability is the primary concern, not a legal impediment.
Advisory Role of Professionals: In cases where a couple plans to marry their cousin, medical professionals, such as genetic counselors, may offer their services. These consultations aim to inform the couple about the potential genetic risks associated with their union and to discuss options for prenatal screening and testing. The decision to seek such advice is typically voluntary, but it is often recommended by healthcare providers due to the increased statistical likelihood of certain genetic conditions.

Key Comparisons

Feature	Marriage Between Cousins in Germany	Marriage Between Siblings in Germany
Legal Permissibility	Permitted	Prohibited (Void)
Legal Basis	No specific prohibition in BGB for collateral relatives.	Explicitly prohibited by BGB (Article 1307) as being in a direct line of descent.
Genetic Risk Focus	Primary consideration is increased risk of recessive genetic disorders in offspring.	Extreme genetic risks due to high degree of shared DNA; legally prohibited.
Typical Recommendation	Genetic counseling may be advised.	Not applicable due to legal prohibition.

Why It Matters

Personal Freedom: The allowance of cousin marriage in Germany upholds the principle of personal autonomy and the freedom of individuals to choose their life partners, provided they meet general legal criteria. It signifies a legal system that doesn't impose arbitrary restrictions on personal relationships based solely on kinship beyond immediate lineal ties.
Public Health Awareness: While not a legal barrier, the potential for genetic risks highlights the importance of informed decision-making in reproductive choices. The German healthcare system's approach emphasizes providing information and resources for prospective parents to make educated decisions about their family planning, thereby promoting responsible parenthood.
Avoiding Discrimination: By not prohibiting cousin marriages, German law avoids discriminating against a particular type of familial relationship, focusing instead on the broader principles of consent and capacity for marriage. This aligns with a legal philosophy that prioritizes individual rights and consensual unions.

In conclusion, individuals in Germany can legally marry their cousins. The legal system permits such unions, but the scientific understanding of potential genetic implications for offspring means that genetic counseling is often recommended. This approach balances personal freedom with the responsibility of informed health decisions for future generations.