Second cousin is what your relation would be to your parent's first cousin's child. (same generation)
First cousin once removed is your relation to your parent's first cousin.
For example, my cousin's daughter is my first cousin, once removed.
My dad's cousin's daughter is my second cousin.
A second cousin is someone who's great grand parent is also your great grand parent.
A second cousin once removed is either the child of your second cousin or the second cousin of your parent.
It's 1 generation further down than the persons 2nd cousin
Mary and John are sister and brother Mary has a daugheter called Anne
John has a son called Andrew
Anne and Andrew are first cousins Anne has a daughter called Betty
Andrew has a son callen Benjamin Anne and Benjamin are first cousins once removed
Andrew and Betty are first cousins once removed
Betty and Benjamin are second cousins Betty has a daughter called Cora
Benjamin has a son called Conor Betty and Conor are second cousins once removed
Benjamin and Cora are second cousins once removed
Cora and Conor are third cousins
== == No. A second cousin is a person of your genealogical generation who is descended from at least one of your great grandparents. A cousin who is once removed is a cousin (first, second third, or more) who is one generation closer to or further from the common ancestor that you share than you are. Thus the children of your aunts and uncles are your first cousins. They are all descended from at least one of your grandparents. A child of your first cousin is also descended from at least one of your grandparents as the youngest common ancestor, but is one generation further from that ancestor than you are. So that child is your first cousin, once removed.
A second cousin and a cousin once removed are notthe same thing.
Your second cousin is the grandchild of the brother or sister of one of your grandparents.
Your first cousin, once removed is the child of your first cousin (the grandchild of the brother or sister of one of your parents) or the first cousin of one of your parents (the grandchild of the brother or sister of one of your grandparents.)
The relationships become more complex to describe when you get into second cousins once removed, third cousins once removed and more distant relationships.
The two terms describe two different relationships.
Your first cousins are the children of your aunts and uncles.
Your second cousins are the grandchildren of your grandparents' brothers and sisters.
You have two kinds of first cousins, once removed.
Someone is your second cousin if one of their parents and one of yours are first cousins (i.e. have common grandparents). Someone is your first cousin once removed if they are the child of one of your first cousins. The number of "removed's" refers to the difference in the number of generations from a common ancestor. Thus, you are also a first cousin once removed to your parents' cousins, since you are three generations from your great grandparent and your parents' cousins are only two.
Genealogically, it looks like this:
Great-Grandparent
/ \
Your Grandparent Great-aunt/uncle
/ \ \
Your parent Your aunt/uncle Your parent's cousin
/ \ \
You Your First cousin Your Second Cousin
\
Your first cousin, once removed
First Cousins: The relationship between you and the children of your aunts and uncles
First Cousins Once Removed: The relationship between you and your first cousins children
Second Cousins: The relationship between your children and your first cousins children
Your first cousin, once removed is either:
Which one it is depends on which generation the two of you are in.
If two people are second cousins, they are each the grandchild of two people who were siblings (brothers or sisters).
Your dad's cousin would be your cousin, once removed. The 'once removed' means that there is a generation difference between you and your dad's cousin. Your granddad's cousin would be your cousin, twice removed. The 'twice removed' means there are two generations difference between you and your granddad's cousin.
You and your second cousin share a common great grandparent. There is a difference of two generation between the grandchild and you. That would make you second cousins twice removed.
Your grandmother's second cousin is also your second cousin, but twice removed. The twice removed means the number of generations between you. Your mother's first cousin is your first cousin once removed. If your mother's first cousin has children, they are your second cousins.
Your mother and her second cousin share a common great grandparent. There is a difference on one generation between the two of you. That would make them a second cousin once removed.
Your parent's first cousin is your first cousin once-removed . Your parent's second cousin is your second cousin, once removed. And so forth...
Your father's first cousin's grandchild is your second cousin, once removed. Your father's second cousin's grandchild is your third cousin, once removed. Your father's third cousin's grandchild is your fourth cousin, once removed. And so forth.
The child of your first cousin, once removed, is your first cousin, twice removed, or is your second cousin, depending.
The son of your second cousin is your second cousin, once removed. You are also his second cousin, once removed.
Your second cousin's child is your second cousin, once removed. Your second cousin's child and your child are third cousins to each other.
Your mother's second cousin twice removed is either your third cousin once removed or your second cousin three times removed. Which it is depends on whether the second cousin twice removed is the grandchild of your mother's second cousin or the grandparent of her fourth cousin.
Your first cousin's grandchildren are your first cousins, twice removed. Your second cousin's grandchildren are your second cousins, twice removed. And so forth.
Your parent's first cousin is your first cousin, once removed. Your parent's first cousin, once removed is your first cousin, twice removed. Your parent's second cousin is your second cousin, once removed. Your parent's second cousin, once removed is your second cousin, twice removed.