What is the forbidden marriage 9.?

The Forbidden Marriage 9 is a legal ruling in Jewish law that prohibits a marriage between certain family members. Specifically, it prohibits marriage between a man and his sister, half-sister, stepmother, mother-in-law, daughter-in-law, granddaughter, aunt, or great-aunt. This ruling is based on the Torah's prohibition against incest, which is considered a grave sin in Judaism. Violating this law is considered a major transgression and can result in serious consequences, including excommunication from the Jewish community. However, it is important to note that this ruling only applies to Jews, and other cultures and religions may have different laws and customs regarding acceptable marriage partners.