This study entitled Financial transactions between Father and Son compares between Islamic law and the Personal Status Law of the Sultanate of Oman as well as the Omani Civil Law. The study design consists of an introduction and two chapters. The introduction offers a definition of the technical terms used in the title. The first chapter discusses financial rights between father and son in both Islamic law and Omani Law. It is divided into three subchapters; The first subchapter deals with alimony between father and son the second with financial mandate, and the third with the extent of the father's entitlement to his son's possessions. The second chapter discusses financial contracts between father and son in Islamic law and Omani law. It starts with a definition of the reality of the contract and its divisions in both Islamic Law and Omani Law, and then mentions compensational contracts between father and son. It concentrates in its presentation on buying and leasing contracts. The chapter concludes with donation contracts between father and son as represented by the contract of gifts (hiba) and loan (qard). Among the most important results the researcher arrived at is that the specifications made for the father can be lead back to three main reasons, fatherhood, financial mandate, and property. Alimony is binding for a woman in two cases: On the wealthy mother in case of the father's insolvency, and on the wealthy daughter for her insolvent parents. The son has the same responsibility, both according to their financial means. Finally, we ask Allah for success, acceptance of this work and perseverance. Peace and blessings be on the Prophet Muhammad and those following him.