Is the son responsible for the usurious interest accrued on a deposit his father made for him when he was young, or is the father responsible?

Usurious bank interests are impermissible for a Muslim to own or consume. They must be taken and disposed of by spending them on charitable causes, such as building mosques and hospitals, or by giving them as Sadaqa to the poor. Not being responsible for depositing money in a usurious bank during childhood does not legitimize personal use of usurious interests, as that constitutes clear consumption of Riba.