Family DNA Percentages

What do you have in common with your grandparents, uncles, half-siblings, nephews and grandchildren? 25%.

 100%50%25%12%6%
-4    parents of parents of parents of parents
-3   parents of parents of parentssiblings of parents of parents of parents
-2  parents of parentssiblings of parents of parentshalf-siblings of parents of parents
-1 parentssiblings of parentshalf-siblings of parentschildren of siblings of parents of parents
0yousiblingshalf-siblingschildren of siblings of parentschildren of half-siblings of parents
+1 childrenchildren of siblingschildren of half-siblingschildren of children of siblings of parents
+2  children of childrenchildren of children of siblingschildren of children of half-siblings
+3   children of children of childrenchildren of children of children of siblings
+4    children of children of children of children

Each row is a generation. Each column is an expected percentage of shared genes.

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Updated on 2019 Oct 2.
DISCLAIMER: This is not professional advice. The ideas and opinions presented here are my own, not necessarily those of my employer.