What is the ruling on what the grandmother did when she placed an insecticide near her two premature infants – which led to their death – and is she required to fast two consecutive months for each child, and is it permissible for one of her relatives to fast on her behalf if she is unable?

The seven-month gestation period for the twins does not diminish their blood money in any way, as long as they were born alive. Since the grandmother caused their death, the blood money for accidental killing is obligatory upon her 'aqilah (male relatives on the father's side) for each child. She is also obligated to offer expiation for accidental killing for each child, which is the expiation for accidental killing that multiplies with the number of those killed. If she is unable to fast, she moves to feeding the poor.