Merging two ancestors (actually same person) into one.

HI!

I'm writing a book and I'm using Geni to create the family tree of the characters (Isabel Finsey is also a character). One of her (fictional) ancestors is Marie Antoinette, whose (real) mother and father both have a common ancestor: Ferdinand III, Holy Roman Emperor, because he had many wives throughout his life (Eleanor Gonzaga is Antoinette's ancestor from her father's side and Maria Anna of Spain from Anoinette's mother's side). I currently have Ferdinand III as two people (one on Antoinette's mother's side, the other on her father's side). How can I merge the two Ferdinands into one person?

I also attached a picture of it.

Thanks!