The widow of Lord Lucan said yesterday she was planning legal action against her son to recover personal documents she fears will be used for a book about his missing father.
The Dowager Countess of Lucan, who is planning to write her own book, says the move is the latest stage in a rift which began in 1982 when her three children chose to live with their aunt and uncle.
She says she has not seen her two daughters for 16 years or her son, George Bingham, who is the heir to his father's title, for four years.
Lady Lucan, aged 62, said of her children: "I don't trust them. I don't want to hear that I am a liar or a bad mother. If I was a bad mother, too bad.
"I am so disgusted with them that I feel ashamed to be their mother. To be loyal to your own family is paramount. To be loyal to another family is despicable, especially as they know how I had suffered.
"I am not sentimental about children. They are just a hotchpotch of genes: me, myancestors and him (Lord Lucan) and his ancestors. I am just the birth mother. I have no feelings of wanting to see them."