Answer:
(Fatwa: 1696/1223/L=1431)
If your elder brother was handling the whole business after the death of your father with the consent of you people and he was taking care of all the property, then within the period of 30 years whatever earning he added shall be included in the inheritance. And all the heirs of deceased shall get their share (as per the Shari’ah) in all the inheritance including the increment.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
