The psychiatrist brother of Chancellor George Osborne faces being struck off from the medical profession after admitting to an affair with a "vulnerable" patient.

A disciplinary tribunal has found that the behaviour of married Dr Adam Osborne was "profoundly unacceptable" and ruled that his fitness to practise was impaired by reason of misconduct.

The Medical Practitioners Tribunal Service (MPTS) will now decide on what sanction, if any, to impose on Dr Osborne, who is five years younger than his Chancellor brother.

The sanction could see the doctor have conditions put on his registration, suspended or even struck off.

The hearing, which began on Monday, heard the woman, referred to as Patient A, had been under Dr Osborne's care between February 2011 and late 2014 and had a history of mental ill health.

When Patient A made a complaint to the General Medical Council (GMC) Dr Osborne begged her to retract it, telling her in threatening emails over a 10 day period that it would "destroy" his family in public.

Dr Osborne, who is currently suspended by the GMC, admits that he knew, or ought reasonably to have known, that the woman was a vulnerable patient because of her history of mental ill health.

He also admitted that between February 14 2015 and February 24 2015 he sent inappropriate emails to Patient A which referred to requests that she withdraw her complaint to the GMC against him, made threats towards her and the consequences for her family if she did not withdraw her complaint and an accusation that she had seduced him.

Chairman of the tribunal Dr Nigel Callaghan said that it had not been a "one-off occurrence" and that he had been aware from the outset that the relationship was inappropriate by his insistence that Patient A agree not to report him.

He said: "The tribunal does not consider that Dr Osborne's actions are easily remediable. This was not a fleeting relationship but sustained over a period of two years.

"Dr Osborne attempted to persuade Patient A to withdraw the complaint by sending inappropriate emails to her over a ten day period when he knew she had taken an overdose, and was therefore in a particularly vulnerable and fragile state."

He added: "The tribunal regards Dr Osborne's behaviour as profoundly unacceptable and undermines the public's confidence in the medical profession."