You shouldn't marry your family members.
James fell in love with his cousin as soon as he saw her at a family reunion.
James wants to marry someone with whom he's in love.
James avoids his cousin, so he won't feel tempted, and instead starts wooing an old friend from high school.
James proposes to his cousin and marries her despite the objections of their family.
James gradually forgets his cousin, falls in love with his friend, marries her and has a healthy child.
The cousin gets pregnant with a baby with serious genetic defects, and James has to pay for a therapeutic abortion.