What is the ruling of the Sharia regarding partnership with siblings who deal with usurious bank loans when in need? And should the capital be taken upon the father's death, or according to its current value? And is it permissible to leave the money with them and take its annual profits? And how does one expiate for usurious money that has been consumed?

You must advise your brothers to repent from borrowing with usury, for the sin of usury is tied to the borrower's responsibility. As for the borrowed money, it enters their possession, and they are permitted to benefit from its profits, along with the obligation to repent and rid themselves of the usurious loan by repaying it, and not paying the interest if possible. If your brothers do not desist, do not accept usurious dealings with your money, even if it leads to your departure from the company, as you will take your capital after the company is liquidated. You can invest your money in permissible avenues or Islamic banks. As for the profits from previous years, there is no blame upon you for them due to your lack of knowledge, and because the sin is tied to the borrower's responsibility.