PROLOG Question:

I asked this question multiple times, the solvers always copied from wrong answer without asking question. If you copy from wrong answer, I will downvote it.

Q:

Define a rule for checking if X and Y are cousins of the same generation, i.e., X and Y are descendents of a common person and both are same no. of links down from the common ancestor.

Suppose the double arrows depict the relationship married. Two indi- viduals are also married if they have a common offspring. Rewrite the rules greatnephew and niece taking into account relationships by marriage also.

here is the family tree