Martial arts master Matt Fiddes - who provided protection for the Thriller hitmaker when he was in the UK - is heading to America to lodge court papers and demand the right to see 10-year-old Blanket, whose birth name is Prince Michael Jackson II.
He claims to have given Jackson - who also had two other children, Prince Michael, 15, and 14-year-old Paris - a sperm donation in a London hotel a year before Blanket was born in 2002.
He said: "I am going to lodge my DNA and formally ask the Jacksons for access. I want visitation rights.
"Michael is their father and I do not want that to change, but I want the children back in my life. The only way that's going to happen is through legal action. I think Blanket is mine but I want final proof."
'I used your sperm'
Fiddes - who has vowed to provide officials with a DNA sample so they can confirm his claims that he is the youngster's true biological dad - alleges Jackson's family have refused to speak to him or answer his letters since his death in 2009.
Fiddes - who has three other children - says Jackson even told him he was Blanket's real father in November 2002, after he infamously dangled the then nine-month-old child over a hotel balcony.
He said: "I sat there and asked the question, 'Is Blanket my child?' He said, 'He's my child, Matt, but I used your sperm to produce him.'"
But Fiddes claims Jackson's mother Katherine, 81, has done her best to block his desperate pleas to see Blanket believing he is after money.
Jackson died of acute Propofol intoxication in June 2009 at the age of 50.
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