In Islam, if someone inherits wealth that was earned through haram (forbidden) means, such as through usury (riba), gambling, or unethical business practices, they are encouraged to handle it with careful consideration of Islamic principles. Although they did not acquire the wealth through haram actions themselves, they have a moral responsibility regarding its use. Here are steps they can take to approach this situation appropriately:
1. Distinguish Between Lawful and Unlawful Wealth

• If the inherited wealth includes both halal (permissible) and haram assets, the inheritor should try to separate the portion known to be haram. Islamic scholars generally advise against using any wealth that can be identified as directly derived from prohibited activities.
• If it is difficult to distinguish between lawful and unlawful wealth, a reputable Islamic scholar or financial advisor can help determine how best to separate them.

2. Purify the Inheritance by Donating the Haram Portion

• The haram portion should ideally be given away to charity or used in a way that benefits the public, without any intention of gaining personal reward. Since the wealth was obtained through impermissible means, donating it allows the inheritor to purify their inheritance while disassociating from its original source.
• It’s important to note that donating haram wealth is seen as a means of cleansing it, not as an act of charity that earns religious merit. The purpose is purely to dispose of the wealth responsibly.

3. Consult an Islamic Scholar for Guidance

• Each situation may vary based on the type of wealth, how much of it is haram, and the specific circumstances of the inheritance. A qualified Islamic scholar can offer specific guidance to address the complexities of the case, ensuring the wealth is handled in accordance with Islamic principles.
• Scholars can also help identify reputable ways to dispose of haram funds, such as donating to community development projects or public welfare initiatives that align with Islamic ethics.

4. Use the Halal Portion Responsibly

• Any remaining halal portion of the inheritance can be used and invested as the inheritor wishes, as long as it adheres to Islamic guidelines for wealth management. They should also avoid mixing it with any haram earnings to maintain its purity.

5. Make Sincere Repentance on Behalf of the Deceased

• While the inheritor is not responsible for the choices of the deceased, they can still make dua (supplication) asking Allah to forgive them for any earnings acquired through impermissible means. Acts of charity and prayers made on behalf of the deceased may bring them benefit in the afterlife.