Define Double-first Cousin Meaning

Double-cousin or double-1C:
1- Child of their parent’s full sibling with the other parent’s full sibling.
2- Person who, in relation to the other person, has zero parents and four grandparents in common.

Child of a person's maternal aunt (mother’s sister) with that same person's paternal uncle (father’s brother) or child of a person's paternal aunt (father’s sister) with that same person's maternal uncle (mother’s brother).

1- Child of parent’s full sister and of other parent’s full brother at the same time.
2- Child of paternal aunt (father's sister) and of maternal uncle (mother's brother) at the same time.
3- Child of maternal aunt (mother's sister) and of paternal uncle (father's brother) at the same time.
4- Nibling (biological) of mother and of father at the same time.
5- Two parents's nibling.
6- Person who, in relation to the other person, has zero parents and four grandparents in common.
7- Double-cousin.
8- Double-1C.

Daughter of their grandparent’s full sibling with the other grandparent’s full sibling.

Son of their maternal first cousin with the paternal first cousin or double-first cousin’s son.

Child of their maternal first cousin with the paternal first cousin or double-first cousin’s child.

Daughter of their maternal first cousin with the paternal first cousin or double-first cousin’s daughter.

1- Parent's double-first-cousin.
2- Double-first-cousin's child.
3 - Child of the parent's pibling with the other parent's pibling.
4 - Child of the parent's nibling with the other parent's nibling.
5 - Child of the parent's nibling with the other parent's pibling.

1- Child of their parent’s pibling with the other parent’s pibling.
2- Child of their parent’s nibling with the other parent’s nibling.
3- Child of their parent’s pibling with the other parent’s nibling.
4- Parent's double-first-cousin.
5- Double-first-cousin's child.

Child of their grandparent’s full sibling with the other grandparent’s full sibling.