We require spouse and children to be listed.
IF decedent has a child who predeceased him or her and that child produced grandchildren, the those grandchildren must be listed.
IF there is NO spouse or children, you would list the decedent's parents.
IF no parents have survived the decedent, move on to siblings (if a sibling predeceased the decedent, but produced nieces or nephews, then those nieces/nephews must be listed).
If there are no siblings or nieces / nephews, move onto grandparents (if alive) and then onto decedent's aunts/uncles. Then cousins. Etc.
INSERT KINSHIP CHART