If a person's mother died suddenly without making a will, would giving charity on her behalf have a reward?
  'A'isha said that a person came to the Apostle of Allah (may peace be upon him) and said:                      My mother died suddenly without having made any will. I think she would have definitely given Sadaqa if she had been able to speak. Would she have a reward if I gave Sadaqa on her behalf? He (the Holy Prophet) said: Yes.