The elder of the O'Sullivan's was infamously jailed for life for murder in 1992. Then aged 37, the now 67-year-old stabbed to death Bruce Bryan, a driver for notorious gangster Charlie Kray, in a Chelsea nightclub.
O'Sullivan senior served 18 years behind bars before his release in 2010, which was a far cry from his former life. He had made millions from running sex shops in Soho as his son was growing up.
"It was a very murky world, not one I entered out of choice — but that’s what happens when your dad is involved in an adult bookshop up the West End," O'Sullivan junior told The Sun of his upbringing.
He was forced to take over the family business when his mum was also jailed with a one-year sentence for tax evasion in the 90s. Marie O'Sullivan was also fined £35,000 in 2010 for running an illegal sex shop.
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The Rocket was only 16 at the time of his dad's imprisonment, which he revealed had a major impact on his career when speaking exclusively to the Daily Star in 2020. "He was a big driving force behind me, he kept me on the straight and narrow," said O'Sullivan junior.
"To not have him there was tough, it was teamwork. From 1995-to 2000, I won a few tournaments but I was never really consistent as much as I should have been. I wasted probably five years of my career, messing about really.
"Once I’d won the UK Championship (his first ranking title) there was a monkey off my back. But dad was away and when he went away it took me a year for me to get my head around accepting that he wasn’t going to be around.
“But in a way my intensity level dropped a little bit, I started enjoying myself a bit too much thinking that I’d made it, when really I hadn’t, it was just one tournament. I think it would have been a lot different."