Is there sin upon the wife and children when using electrical appliances bought by the husband in installments through a Murabaha system with a discount from the interest of usurious investment certificates, with the wife's intention to pay their value from her own money?

If the origin of the husband's wealth is lawful, there is no sin upon the wife and children in benefiting from the appliances that the husband bought, even if he paid their installments from usurious interest. The wife is not obligated to pay the price of these appliances from her own money, but she must admonish her husband against usurious transactions.