What is the ruling on my taking things and food from my father's money, which comes to him from forbidden bank interest, knowing that he considers that permissible, and that I take them to preserve affection, and I have read a previous fatwa stating that there is no blame upon me?

There is no blame upon you for eating from your father's food and benefiting from his wealth, as long as the origin of his wealth is lawful, even if he spends from usurious gains. This is because the sin of usurious gains is tied to the father's responsibility, not to the specific money itself. You should gently advise your father and explain the prohibition of usurious transactions.