A Chart for Figuring Relationships
From CompuServe's Genealogy Forums

On the top row, find the relationship of one person to the common ancestor and follow the column straight down. Find the other person's relationship to the common ancestor on the left hand column and follow that row straight across. The relationship is where the projected row & column meet.
 

Common
 Ancestor
Child
Grandchild
  Great       Grandchild
Great         Great
Grandchild
Great
Great
Great
Grandchild
Great
Great
Great
Great
Grandchild
Great
Great
Great
Great
Great
Grandchild
Great
Great
Great
Great
Great
Great
Grandchild
Child
Sibling
Niece or Nephew
Grand
Niece or Nephew
Great Grand
Niece or Nephew
Great Great Grand
Niece or Nephew
Great Great Great Grand
Niece or Nephew
Great Great Great Great Grand
Niece or Nephew
Great Great Great Great Great Grand
Niece or Nephew
Grandchild
Niece or Nephew
First Cousin
First Cousin
Once      Removed
First Cousin
Twice
Removed
First Cousin
Three Times
Removed
First Cousin
Four Times
Removed
First Cousin
Five Times
Removed
First Cousin
Six Times
Removed
Great
Grandchild
Grand
Niece or
Nephew
First Cousin
Once      Removed
Second
Cousin
Second
Cousin
Once      Removed
Second
Cousin
Twice
Removed
Second
Cousin
Three Times    Removed
Second
Cousin
Four Times
Removed
Second
Cousin
Five Times
Removed
Great
Great
Grandchild
Great Grand
Niece or
Nephew
First Cousin
Twice     Removed
Second
Cousin
Once      Removed
Third 
Cousin
Third 
Cousin
Once      Removed
Third 
Cousin
Twice
Removed
Third 
Cousin
Three Times    Removed
Third 
Cousin
Four Times
Removed
Great
Great
Great
Grandchild
Great
Great
Grand
Niece or  Nephew
First Cousin Three Times
Removed
Second
Cousin
Twice     Removed
Third 
Cousin
Once       Removed
Fourth
Cousin
Fourth
Cousin
Once      Removed
Fourth
Cousin
Twice
Removed
Fourth
Cousin
Three Times    Removed
Great
Great
Great
Great
Grandchild
Great
Great
Great
Grand
Niece or  Nephew
First Cousin Four Times
Removed
Second
Cousin
Three Times     Removed
Third 
Cousin
Twice
Removed
Fourth
Cousin
Once       Removed
Fifth
Cousin
Fifth
Cousin
Once      Removed
Fifth
Cousin
Twice
Removed
Great
Great
Great
Great
Great
Grandchild
Great
Great
Great
Great
Grand
Niece or  Nephew
First Cousin
Five Times
Removed
Second
Cousin
Four Times
Removed
Third 
Cousin
Three Times    Removed
Fourth
Cousin
Twice
Removed
Fifth
Cousin
Once      Removed
Sixth
Cousin
Sixth
Cousin
Once      Removed
Great
Great
Great
Great
Great
Great
Grandchild
Great
Great
Great
Great
Great
Grand
Niece or  Nephew
First Cousin
Six Times
Removed
Second
Cousin
Five Times
Removed
Third 
Cousin
Four Times
Removed
Fourth
Cousin
Three Times    Removed
Fifth
Cousin
Twice
Removed
Sixth
Cousin
Once      Removed
Seventh
Cousin