Does a mother have the right to demand that her son pay her the difference in value for a sum of money she gave him, despite the potential for this to cause family problems?

Borrowed wealth is of two types: fungible (mithli) and non-fungible (qīmī). Fungible wealth is that whose units and parts are identical, such as measured goods, weighed goods, and money, and its like must be returned. Non-fungible wealth is that for which no equivalent exists in the market, or if it does, there is a variation in value, such as livestock and clothing. Scholars have differed on what must be returned for non-fungible wealth—whether it is its value or its equivalent in form and appearance. Some have said that its value on the day of borrowing must be returned, while others have said that its like must be returned, based on the Prophet's (peace be upon him) saying: "He commanded him to repay a young camel with a young camel."

Based on this, it is determined whether what the eldest son paid fulfills the loan. In any case, forgiveness among siblings and maintaining kinship ties are desirable matters.