Gary Goldsmith, 52, admitted using a closed fist to hit Julie-Ann Goldsmith, who fell to the ground and was left semi-conscious outside their central London home in the early hours of Oct 13.
Businessman Goldsmith, estimated to be worth £30million, is the younger brother of the Duchess's mother Carole Middleton and attended the weddings of both Kate and Pippa.
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Kate Middleton's uncle, Gary Goldsmith, admitted to physically assaulting his wife, Julie-Ann Goldsmith, on the 14th of November. They are both out, and [the driver] has described having seen Mrs. Goldsmith slapping her husband in the face. An altercation recalled by the prosecutor Kate Shilton, as stated in the Daily Mail, during the trial, which was held today: "The dispute started at the back of the taxi. He says: 'She appears to be unconscious, she isn't moving"'.
Mrs Goldsmith remained on the floor with eyes closed for about 15 seconds before she woke and staggered to her feet and crying, the court heard.
After the incident, Goldsmith was described as "panicked and walking in and out of the house, trying to get her to go back in the house".
The woman was brought to the hospital and was later discharged, the court heard.
At the police station, Goldsmith denied punching his wife, claiming he had pushed her hard with his left hand, but was apologetic for his actions, the court heard. He was then told to have seen Mr. Goldsmith, the hit violently in the face by pressing a left hook. He reportedly became aggressive towards Mr Shepherd when the taxi driver challenged him over the assault.
Chief Magistrate Emma Arbuthnot indicated she would consider a community order over prison. Speaking after meeting Kate, Billy said: "She was saying William was sort of similar and I just wanted to let her know how Family Action have been there for me and I think they need more support". Shepherd said the couple had got in a row before Julie-Anne slapped her husband across the face. Their mother worked in a shop and also did accounts, while their father was a painter and decorator.