Remember that it is entirely possible that a list of grandchildren in an obituary may list grandchildren who are actually step-children of a child of the deceased who is no longer married to the spouse from whom they acquired the step-child. If the grandparents considered their child’s step-child their grandchild, that relationship and consideration may not have ended when their child’s marriage to the parent of the step-child ended.
While these relationships may matter greatly to the individuals involved, DNA is only concerned about which individuals reproduced with which individuals.
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