Phyllis and I were discussing today how closely related you actually are to different people genetically speaking.
After doing some simple calculations and applying a bit of logic, we came up with the following (1/2 means that you share half your genes with that person, and so on):
| 1/2 | child |
| 1/2 | parent |
| 1/2 | sibling |
| 1/4 | grandparent |
| 1/4 | grandchild |
| 1/4 | half-sibling |
| 1/4 | uncle/aunt |
| 1/4 | nephew/niece |
| 1/4 | double cousin (child of mother’s sibling and father’s sibling) |
| 1/8 | greatgrandparent |
| 1/8 | greatgrandchild |
| 1/8 | cousin |
| 1/8 | greatuncle/greataunt |
| 1/16 | greatgreatgrandparent |
| 1/16 | cousin’s child |
| 1/16 | parent’s cousin |