الجواب وبالله التوفيق
According to the Islamic Law of Succession and Inheritance, distribution of an estate will only commence after funeral expenses, debts (including legal costs) and bequests (if any) made to non-heirs - which will not exceed one-third(1/3) of the Estate after debts and funeral expenses have been settled. Thereafter, all assets form part of the Nett Estate and will have to be distributed by making 24 equal shares and giving:
The brother and two sisters of your deceased brother in law will not receive anything.
واللہ اعلم بالصواب