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What is the relationship to me with my cousin's son and daughter?
I need the terms to describe the relationshp. Please let me know that.
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Technically, (according to geneologists) the children of your first cousin are your "first cousins once removed". (They and your children are technically "second cousins" to each other.) However, most people I know would casually refer to them as "second cousins." I don't know if it's different in Englsand, but in the U.S. I don't really know anyone who would say, "He's my first cousin once removed" (unless they were about to make a pun -- "He's my first cousin once removed, but, as you can see, he came back"). You can also just use "cousins" for the whole lot without being more specific.
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See the chart in this article.

http://en.wikipedia.org/wiki/Cousin

CJ
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Comments  
If you share the same grandparents, you are first cousins. Your first cousin's children are first cousins once removed.
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