What is the ruling of the Sharia regarding how to deal with an apartment for which the father had issued a power of attorney for its sale to his son before his death, but the son executed a sale contract for it in his name and falsified its date after his father's death? Should the son pay off the apartment's debt, sell it, and divide its price among the heirs, or should he relinquish it to all the heirs?

A father must be just among his children in giving gifts. Your father erred by singling you out with the power of attorney to sell the apartment. The power of attorney becomes void upon the death of the principal. The apartment must be included in the inheritance and divided according to Islamic law among the heirs. You do not have the right to dispose of it without their permission. Your father's debts must be paid from the estate before its distribution. After the debts are paid, the heirs can agree on how to divide the apartment, whether by owning it collectively, selling it and dividing the proceeds, or other lawful and agreeable solutions.