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Children of siblings (siblins are brothers and sisters) are first cousins. Your parents’ siblings’ children are your first cousins.
Children of first cousins are second cousins. When you have children and your first cousins have children, those children will be second cousins to each other.
Children of second cousins are third cousins, and so on.
Your parents first cousins are your first cousins once removed. Their second cousins are your second cousins once removed. Grandparents’ cousins are yours twice removed, and so on.
I know some people who are half first cousins to president John Adams – seven times removed.
A cousin chart, or table of consanguinity, is helpful in identifying the degree of cousin relationship between two individuals using their most recent common ancestor as the reference point. Cousinship between two individuals can be specifically described in degrees and removes by determining how close, generationally, the common ancestor is to each individual.
Additional modifying words are used to clarify the exact degree of relatedness between the two people. Ordinal numbers are used to specify the number of generations between individuals and a common ancestor, and further clarification of exact cousinship is made by specifying the difference in generational level between the two cousins, if any, by using degrees of remove. For example, “first cousins once removed” describes two individuals with the common ancestor being the grandparent of one cousin (one degree) and the great-grandparent of the other cousin. The cousins themselves are one generation different from each other (one remove).
Look at the chart at the link below, a lot of time, a person’s cousin will be the son or daughter, of a person’s sister or brother.
Source(s): http://en.wikipedia.org/wiki/Cousin
A first cousin is someone who has different parents but the same grandparents; i.e., you are the offspring of your parents, your first cousin would be the offspring of your mother’s or father’s brother or sister (child of an aunt or uncle through blood).
And, before I get my tongue tied up in knots, just see this site:
http://genealogy.about.com/library/nrelationshipch…
Source(s): life; google search for reference
First cousins share the same grandparents.
Your first cousins are the children of your parents’ brothers and sisters.
Second cousins share the same great-grandparents.
Your second cousins are the children of your parents’ first cousins.
Third cousins share the same great-great grandparents.
Your third cousins are the children of your parents’ second cousins.
And so on…