Please translate the title of Ola Tungesvik´s book and also did he have any children from his first marriage?

Ola Tungesvik has written a book in 1997 called "Jos vain saan olla onnellinen...: tosi kertomus rakkaudesta". The title is said to be a quote of his second wife Seija dating back in 1965. Seija was describing her battle towards cancer in a TV interview. Loose translation of the title would be the following:

If only I get to be happy ...: A true story about love.

Ola tells in this autobiographical book about his almost magical love towards Seija. In the beginning of the book he says that he has one son from his previous marriage. The book ends with Seija's death.

Gunnar Mattsson's book "Prinsessa" (Princess) from 1965 tells about the same person and was a smash hit in it's time. It seems that both Ola's and Seija's lives have been more or less amazing.