Customary inheritance practices among the Bugis community in Soppeng demonstrate a continuing interaction between local norms and Islamic inheritance law. This study examines how Pappaseng Riolo, as a form of ancestral wisdom, shapes the distribution of inheritance through family deliberation and how these practices relate to the normative principles of Islamic inheritance law. Employing a qualitative approach with an Islamic inheritance law perspective, the study draws on in-depth interviews and documentation involving religious leaders, customary leaders, village heads, and community members across five subdistricts in Soppeng Regency. Data were analyzed through data reduction, data display, and conclusion drawing. The findings demonstrate that inheritance distribution under Pappaseng Riolo is characterized by three patterns: equal distribution (1:1), the Qur’anic 2:1 ratio, and distribution without a predetermined ratio. Family deliberation constitutes the central mechanism through which heirs negotiate the distribution by considering their respective circumstances, parental transfers received during the parents’ lifetime, and the consensus reached among family members. The study argues that Pappaseng Riolo does not function as an alternative normative basis for determining inheritance rights but as a cultural mechanism for implementing and contextualizing inheritance distribution within the family. Its compatibility with Islamic inheritance law depends on the absence of coercion, recognition of legitimate heirs, and voluntary agreement among the parties. The study contributes to comparative Islamic legal scholarship by demonstrating that customary and Islamic inheritance norms can coexist through deliberative accommodation without necessarily displacing the normative framework of faraidh. This finding highlights the importance of integrating Islamic inheritance literacy with locally embedded cultural values in customary Muslim communities.