Five couples are on the beach.

Catehrine, Diane, Peggy, Richelle and Maureen
Roland, Daniel, Luciano, Ronald and Denis.

Hints   :  1- Luciano's wife is building a sand castle with Richelle's husband.
                 2- Catherine is playing Frisbee with her husband  Daniel.
                 3- Roland et Diane are reading a book.
                 4- Ronald et Peggy are dinking lemonade.
                 5- Diane is not Ronald's wife.

Question: Who is Roland's wife?

See answer