Haha, Godfather III is only worth watching for Mary & Vincent. Even so, the relationship def lacked chemistry. In "Monsoon Wedding" there is a cousin romance, and it's not the main focus. Lots of cute glaces & such. I really can't think of any others, hmmm... Oh! There was also a Spanish Novela that was on a few months back called "Perro Amor." The 2/3 main characters are cousins and they have a very intense (mostly sexual) relationship.