A drunken yob launched a vicious attack on his elderly parents after returning to the family home after a drinking session.
Simon Dixon, 42, hit his father so hard he caused two displaced fractures to his jaw.
He also assaulted his mother during the attack on November 11.
Now Dixon has been ordered to stay away from the family home in Willow Lane, Lancaster for two years and jailed for 14 months in a bid to tackle his alcoholism.
Judge Simon Newell, sentencing, said: “I don’t know their precise ages but I believe Mr Dixon is about 70 and I assume your mother is about the same sort of age.
“I have seen the photographs of the injuries that were sustained by your father. I have read the circumstances in which they came about and I have read his victim impact statement.
“It is sad - pulls on the heart strings - to see a father who cares for his son but also the rest of his family and his wife having to come to terms with the fact his son has severe drink problems.
“Those drink problems manifest themselves to such an extent that they can’t be safe in your presence.
“It is not just them, it is others in the last ten years or so, particularly those who are close to you.
“There is a real danger of you causing severe harm to people who care about and you, when sober, care about them.”
The court heard that while Dixon has been on remand he has faced up to his drinking problems and started on a program to address his drinking.
Judge Newell said: “The best way to resolve things for all parties involved and taking on board the fact you have a drink problem and have been incarcerated for a month is for that incarceration to continue.
“It won’t continue for long but it will hopefully be for long enough for you to become sober and take such courses that when you are released your relationships are able to go forward without violence.
Dixon pleaded guilty to causing grievous bodily harm (GBH) to his father and common assault of his mother at Preston Crown Court.