Shock for the married couple who discovered they are twins separated at birth

The matter will be debated next week at the next reading of the controversial bill.

He said: "One of its provisions is to deny the child's right to know about its biological identity.

"This means the state is colluding in a deception. The Government has drawn up legislation that will deny you this knowledge until you are 18. But you could be married by then, or have fallen in love with someone.

"This will lead to these heartbreaking situations.

"If you start trying to conceal someone's identity, sooner or later the truth will out.

"And if you don't know you are biologically related to someone, you may become attracted to them and tragedies like this may occur."