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