Is it permissible to transfer inherited money from an interest-based bank to an Islamic bank, or to donate it, and does the use of usurious interest bring sin upon the heirs or only upon the deceased, and what should be done to save the deceased from torment?

Placing money in interest-based banks and dealing with usurious interest is forbidden by Islamic law. The sin includes the father, the children, and the mother, because they left the money in the bank and took the interest after knowing its impermissibility. Repentance from this is obligatory and is completed by withdrawing the money from the interest-based bank and disposing of the interest by spending it on Muslim welfare projects, and by giving out as charity an amount equivalent to what was spent from it after knowing its impermissibility. A poor person may take from it what suffices his needs. The remaining permissible money may be placed in an Islamic bank or invested in a permissible project. It is obligatory to seek forgiveness for the father, supplicate for him, and give charity on his behalf.