Here it is:
What Is a First Cousin, Twice Removed?
If someone walked up to you and said "Howdy, I'm your third cousin, twice
removed," would you have any idea what they meant? Most people have a good
understanding of basic relationship words such as "mother," "father,"
"aunt,"
"uncle," "brother," and "sister." But what about the
relationship terms that
we don't use in everyday speech? Terms like "second cousin" and "first
cousin, once removed"? We don't tend to speak about our relationships in such
exact terms ("cousin" seems good enough when you are introducing one person
to another), so most of us aren't familiar with what these words mean.
Relationship Terms
Sometimes, especially when working on your family history, it's handy to know
how to describe your family relationships more exactly. The definitions below
should help you out.
Cousin (a.k.a "first cousin")
Your first cousins are the people in your family who have two of the same
grandparents as you. In other words, they are the children of your aunts and
uncles.
Second Cousin
Your second cousins are the people in your family who have the same
great-grandparents as you., but not the same grandparents.
Third, Fourth, and Fifth Cousins
Your third cousins have the same great-great-grandparents, fourth cousins
have the same great-great-great-grandparents, and so on.
Removed
When the word "removed" is used to describe a relationship, it indicates that
the two people are from different generations. You and your first cousins are
in the same generation (two generations younger than your grandparents), so
the word "removed" is not used to describe your relationship.
The words "once removed" mean that there is a difference of one generation.
For example, your mother's first cousin is your first cousin, once removed.
This is because your mother's first cousin is one generation younger than
your grandparents and you are two generations younger than your grandparents.
This one-generation difference equals "once removed."
Twice removed means that there is a two-generation difference. You are two
generations younger than a first cousin of your grandmother, so you and your
grandmother's first cousin are first cousins, twice removed.