Is there anything due from a father who sold his shares in a non-Islamic bank after their price had doubled, and then used the proceeds and profits to purchase a plot of land for his residence?

The father must dispose of the unlawful money he acquired by spending it on the interests of Muslims or giving it to the poor and needy, so that his wealth may become pure. He is not obliged to sell the house he bought with this money, and he is permitted to benefit from it, because the unlawfulness is related to his responsibility (dhimmah) and not to the purchased item itself. He must disburse the amount of unlawful money and not benefit from it for himself or those he supports, unless he is poor and in need, in which case he may take according to his need.