The property and wealth left by father should be distributed among his heirs after his death as soon as possible. Paying the debt of father from his wealth was alright, but it was unlawful on the part of the brothers to use it in personal needs. A joint inheritance cannot be used by anyone before distribution. If they want to sell the property, they can do so only after mutual advice of all three brothers, sisters and mother. If all agree to sell, then according to the Quran, entire property will be distributed in 72 shares, out of which 9 shares will go to mother, 14-14 shares to each brother and 7-7 shares to each sister. The cash left by your father will also be distributed in the same way, likewise the money invested in share and all the articles of the house possessed by your father. Similarly, the total money earned through the inherited money also will be dealt in the same manner. In short, every thing will be distributed as per the Shariah and will be handed over to every heir. Now, he or she has full control of his or her shares whether to use or to invest in business.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband