Jeff and Fallon got married and even had a baby, though Fallon initially wanted to abort the child. The two were also not related, while in the reboot, it is revealed that Jeff is Fallon's distant cousin.

Do Fallon and Jeff get divorced?

Fallon learns that she is pregnant in "The Mid-East Meeting", but decides to have divorce Jeff and have an abortion. Blake finds out and rushes to stop her, but when he arrives he learns that she could not go through with it.

Who does Fallon Carrington marry?

The wedding of Fallon Carrington and Jeff Colby took place in the fifteen episode of the first season Our Turn Now.