Gerald128's definitions
Double-2C:
Person who, in relation to the other person, has zero parents, zero grandparents and four great-grandparents in common.
Person who, in relation to the other person, has zero parents, zero grandparents and four great-grandparents in common.
My double-second-cousin is a good person.
by Gerald128 May 15, 2021
Get the double-second-cousinmug. Sesqua-3C:
Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents and seven great-great-grandparents in common.
Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents and seven great-great-grandparents in common.
My sesqua-third-cousin is a good person.
by Gerald128 May 15, 2021
Get the sesqua-third-cousinmug. Sibling's great-great-grandchild.
I have 212 great-great-grandniblings (106 great-great-grandnieces and 106 great-great-grandnephews).
by Gerald128 April 6, 2021
Get the great-great-grandniblingmug. My grandnephew-in-law is a good person.
by Gerald128 April 7, 2021
Get the grandnephew-in-lawmug. 
Cousin or 1C:
1- Parent's full sibling's child.
2- Person who, in relation to the other person, has zero parents and two grandparents (maternal or paternal) in common.
1- Parent's full sibling's child.
2- Person who, in relation to the other person, has zero parents and two grandparents (maternal or paternal) in common.
My first-cousin is a good person.
by Gerald128 May 15, 2021
Get the first-cousinmug. My granduncle-in-law is a good person.
by Gerald128 April 7, 2021
Get the granduncle-in-lawmug.