M y thoughts are that all information in a family history should be documented and any condition other than what is considered normal should be noted.If your history is to be a blood line history it is proper to list any and all members of that blood line. If family members are not of that blood line a simple notation of that difference insures that future family researchers are advised of that saturation. Years ago the life span was much shorter, Medical conditions much poorer and the oldest sister may have died in giving birth and her parents or a younger family member took her children in as their own, in which case the child carried his fathers DNA but was raised as a full fleged family member. So blood line is a way, but LOVE Line is another way. All of the children who were put on the orphans trains during the depression were loved family members but carried a different blood line, Happy Search. . Jack Pace /Wms.burg Va.