Is it permissible to consider a loan provided by a brother as part of a partnership in a building and its profits, after the inability to repay the debt on time?

The creditor son committed two errors: first, demanding his debt from his father, and second, insisting and compelling him despite his father's financial hardship. What was obligatory was to grant him respite until he found ease.

If the creditor and debtor agree to take something other than the original type of debt as payment, such as real estate, this is permissible on condition that the acquired item is expedited, meaning the value of the property is known, and the creditor takes possession of it by vacating it, so that it does not become a cancellation of debt for debt.