Do the children of the deceased woman who aborted her fetus owe expiation, given that she intended to expiate but did not know the method?

Abortion after the ensoulment is a major sin and a grave disobedience, because it is the killing of a soul whose killing Allah has forbidden except by right. The one who caused it is liable for the blood money of the fetus (one-tenth of the mother's blood money) and the expiation for unintentional killing (freeing a believing slave; if one cannot find one, then fasting for two consecutive months). If the mother dies before performing them, her children should fulfill them on her behalf.