Are you your own grandpa?
FIRST COUSINS are the people in your family who have two of the same grandparents as you. They are the children of your aunts and uncles.
SECOND COUSINS are the relatives with the same great grandparents as you, but not the same grandparents.
THIRD COUSINS have the same great great grandparents
FOURTH COUSINS have the same great great great greatgrandparents, and so on.
What Does Removed Mean?
Removed tells us that two related people [example: first cousin twice removed] are simply from different generations. First cousins are in the same generation. First cousins are two generations younger than their same set of grandparents. In this case, they are not removed.
If you are cousins once removed, there is a difference of one generation between you and your cousin. [Example: this would mean that your mother's first cousin though also your first cousin is your first cousin once removed because you are of two different generations.
Once removed simply means 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 our 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 that a first cousin of your grandmother, so you and your grandmother's first cousin are first cousins, twice removed.