The estate of the decedent shall be inherited in the following order: First in order: spouse, children, parents. Second in order: Brothers and sisters, paternal grandparents, maternal grandparents.

遗产按照下列顺序继承，第一顺序：配偶、子女、父母。第二顺序：兄弟姐妹、祖父母、外祖父母。

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On the other hand, if the deceased spouse is not already receiving benefits, the first factor is the amount that the decedent would have received at the current age, if he or she were still living.

FORBES: The Social Security Survivor Benefit - Part 1