Is there any obligation upon the mother if one of her sons ran over her other infant son, who is two years old, and he died while she was asleep?

The mother did not neglect the preservation of her child, as she was asleep, and there is no negligence in sleep. She is not liable for blood money (Diyya) or expiation (Kaffarah (definition)) because the child's death was caused by the direct action of someone else. The jurisprudential rule states: "If a direct actor and an indirect cause converge, the ruling is attributed to the direct actor."