One can pray to St. Raphael to lead him or her to the right partner but am not sure if it can be revealed in a dream.
The dream's meaning depends on which saint is seen. The dream means that you feel the need of the qualities represented by that saint or that you feel a need for that particular saint's guidance and protection.
There is no patron saint of the future.
The patron saints of single women are:Andrew the Apostle Catherine of Alexandria Nicholas of Myra
Anne was married to Saint Joachim according to tradition.
Saint Joseph the spouse of the Blessed Virgin Mary.
St. Joseph, spouse of the Blessed Virgin Mary, is the paton saint of a holy death.
St. Joseph, spouse of the Virgin Mary, is the patron saint of married couples.
There is no patron saint for dreaming about a deceased son.
Saint Joseph, the spouse of Mary, did not join an order. Orders did not exist until much later.
Saint Anthony is the patron saint of many things, he is also known as a great miracle worker. In some European traditions (for example Portuguese, Sicilian, etc.) Saint Anthony is also known as the matchmaker. He is known to help find lost articles and missing people, so it's only appropriate that he'd be the one to call upon when searching for a future spouse.
Joseph was the spouse of the Blessed Virgin Mary as well as the foster father of Jesus and did a superb job at both.
The most popular saint for single women looking for a spouse is St. Anthony of Padua.