Causing a fire in the house which killed the mother

Q: My problem is that I unintentionally caused our house to set fire and my mother was burnt inside it. This took place twenty years ago. Since then I feel conscience-stricken. I wonder whether I am to blame, and whether I should observe Sawm (Fast) or give charity to die comfortably. I had a disturbing nightmare some time ago. I see a camel running after me to devour me. This nightmare haunts me continuously. I hope Your Eminence will guide me in this respect, so that my heart may be satisfied. Am I to blame for my mother's death? May Allah protect you. (Part No. 21; Page No. 427

A: If there is negligence on your part that caused this burning that caused the death of your mother, you should pay the Diyah (blood money) to the heirs of your mother. You should also offer Kaffarah (expiation) for involuntary manslaughter: to free a believing slave; otherwise, you should fast for two consecutive months. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.