The distinction in Islamic law is that all inherited property, including that derived from the original property and that is owned jointly, can be accounted for in order to cover the successor's rights. Joint property or joint property is excluded from inheritance. But in accordance with customary law, the heir's interests can only be taken into consideration for a limited range of joint property, or "gono gini." This study used a normative-sociological legal research methodology. Implemented law studies focus on how normative legal obligations (such as contracts, laws, or codification) are applied or enforced in all situations. social conventions that are specific. Implementation in practice is a crucial element in achieving predetermined goals, which is a social and factual truth.