You have 50% DNA from father and 50% from mother but (in theory at least) you could have 50% DNA from paternal grandfather and 0% from paternal grandmother.
Ancestry is only saying what the likely relationship is, not what it actually is.
Sib's child is more closely related to some people than I am - which doesn't seem fair! - and makes a mockery of relationships.
__________________
The chestnuts cast their flambeaux
|