Cousin - Offspring of an uncle or aunt. A cousin is a relative with whom a person shares one or more common ancestors. Wikipedia
James Earl is my cousin and Tom is James cousin but Tom is not my cousin.
How is James related to me?
We share a gg grandparent, James Markham, which makes us second cousins.
James great grandmother Catherine Matilda Markham Scott, and my great grandfather Monroe Markham were siblings.
We are related through our maternal sides.
How is James related to Tom?
James' gg grandparents, Franklin Scott and Sallie Coleman, are the great grandparents of Tom Isaac, which makes them second cousins once removed.
They are related through their maternal sides.