In Judaism, there are certain relationships that are considered "forbidden". This means that they are not allowed or accepted according to Jewish law. The reason for this is to maintain family cohesion, prevent potential conflicts or problems within the family, and promote healthy relationships.
One of the most important commandments in Judaism is to honor your parents, and this includes respecting their wishes when it comes to choosing a spouse. Incestuous relationships, which are like romantic or sexual relationships between close family members, are strictly prohibited in Jewish law. This means that you cannot marry or have sexual relations with your parents, siblings, or grandparents.
Additionally, there are certain forms of non-incestuous relationships that are also prohibited in Judaism. For example, a man cannot marry his ex-wife's sister, and a woman cannot marry her husband's brother. These laws are designed to prevent family conflicts and ensure that everyone is treated with respect.
Overall, the forbidden relationships in Judaism are designed to promote healthy family relationships and prevent conflicts that could arise from intermingling with close family members. While they may seem restrictive, they are important for maintaining peace and respect within the family structure.