You share copies of your genes in these proportions with your close kin:
- 1, ie a complete matching set of your genes, with your identical twin.
- 1/2 your genes with your sibling or parent.
- 1/4 of your genes with your grandchild, grandparent, niece, nephew, aunt or uncle.
- 1/8 of your genes with your great grandchild, first cousin, great aunt or great uncle.
- Your genetic relatedness quickly dwindles with more distant family members and is least with strangers.