The celebrity chef penned the letter after the fall-out with his father-in-law, Chris Hutcheson, whom he sacked last month after 12 years as business partners.
Ramsay said he was writing the appeal after his wife, Tana, received a letter from her mother, Greta, asking her to stay away from her family. He wrote: "Listening to Tana in floods of tears reading your letter from you asking that she stays away from her family is so awfully wrong."
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Hide AdHe said Mr Hutcheson had "suggested my mood swings were down to involvement with drugs; my God did that hurt. How dare he ever suggest this on the back of my frustration and dealings with my younger brother and his addiction".