Ruling on someone who dozed off while driving and had an accident that caused his wife's death

Q: I had an accident and the car turned over as I fell asleep while driving. As a consequence:my wife died instantly and my mother went into a coma for two months. Afterwards my mother regained consciousness and found out about the accident. She had some complications and phlegm in her chest. Three months later, she died in the hospital. Now, what should I do after causing the death of two people, in the case of the one who died instantly and the one who died three months after the accident? Should I offer Kaffarah (expiation)?

A: You have to offer two Kaffarahs for causing death of your wife and mother. You have to free a Muslim slave for each person you killed. If you are unable to do so, (Part No. 21; Page No. 314) you have to fast two successive months.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.