Answer:
(Fatwa: 915/889=D/1429)
You should do isal-e-sawab exclusively for him through kalimah and tilawah. All the family members should recite something and deliver its reward to him. Likewise, they can do it by charity and feeding the needy. The family members should leave sinful acts and adhere to good deeds, salah, zakah etc.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
