An explanation of family connections
Your first cousins are the people in your family who have at least one of the same grandparents as you. In other words, they are the children of your aunts and uncles.
Your second cousins are the people in your family who share the same great-grandparent with you.
THIRD & FOURTH COUSINS
Your third cousins share at least one great-great-grandparent, fourth cousins share a great-great-great-grandparent, and so on.
When the word “removed” is used to describe a relationship, it indicates that the two people are from different generations. “Once removed” indicates a difference of one generation, “twice removed” indicates a difference of two generations, and so forth.
DOUBLE FIRST COUSINS
First cousins twice, once on your father’s side and once on your mother’s side, since your father’s sibling married your mother’s sibling
KITH and KIN
“Kith” are friends and acquaintances whereas “Kin” are blood relatives or someone treated like one.
*****To give an example, the child of your first cousin is your first cousin, once removed. That is, your cousin’s child would be “almost” your first cousin, except that he or she is one generation removed from that relationship. Likewise, the grandchild of your first cousin is your first cousin, twice removed (two generations removed from being a first cousin).
Many people confuse the term “first cousin, once removed” with “second cousin.” The two are not the same.
SO,my father’s first cousin is my first cousin once removed
My fathers first cousin’s children are my second cousins