first degree relative blood risky for infants
First, Second and Third Degree Relative. A first-degree relative is defined as a close blood relative which includes the individual's parents, full siblings, or children.A second-degree relative is defined as a blood relative which includes the individual's grandparents, grandchildren, aunts, uncles, nephews, nieces or half-siblings.A third-degree relative is defined as a blood relative which includes the individualâs first-cousins, great-grandparents or great grandchildren. second-degree relative is defined as a blood relative which includes the individual's grandparents, grandchildren, aunts, uncles, nephews, nieces or half-siblings.