it means that one of them is a descendant of the other person's great-great-great-great-great-great-great-great-grandparent and the other is a a descendant of the other person's great-great-great-great-great-great-great-great-great-great-grandparent.
I stopped over at ask.com this is what I found,.. it means two generations away from you. For example, my mother's cousin is my cousin "once removed" she is of my mother's generation which is the one before mine. A cousin who is "twice removed" would be the same generation as your grandparents. Source(s): interest in geneology http://www.genealogy.com/16_cousn.html
What does it mean? Not much. It's so convoluted you could deduce that quantum string theory is the root cause for malaria. Yes, they may actually be related through a very long string of associations, but all that proves is that we are all likely related in some distant, believe it or not....
The degree of cousinhood depends on the distance from the common ancestor. For example:
Adam m. Beatrice / ______________________________________________ / / Charles m. Doris Edward m. Fiona / / / / / / Geoffrey m. Harriet Ian m. Janet / / / / / / Keith m. Margaret Norman m. Olivia / / / / / / Peter m. Queenie Robert m. Sarah
Charles and Edward are brothers. Geoffrey and Ian are first cousins. Keith and Norman are second cousins. Peter and Robert are third cousins.
Geoffrey and Norman are first cousins once removed, as are Keith and Ian.
Geoffrey and Robert are first cousins twice removed, as are Peter and Ian.
Keith and Robert are second cousins once removed, as are Peter and Norman.