No. Charlie Kray, the older brother of gangster twins Reggie and Ronnie Kray, only had one son, Gary, and a daughter named Nancy. Charlie's fatherhood of Nancy was perpetually in question, but Charlie still raised his daughter as his own nevertheless. A few years after Charlie's 2000 death from heart disease, there were reports Nancy made a request to have his body exhumed for DNA testing to prove he was really her father.
Due to the situation with Nancy's unsure parentage, Gary Kray at this point was the only child definitively known to have been born to any of the Kray brothers, as neither Ronnie nor Reggie fathered any children. Gary died of AIDS in 1996 at the age of 44. Gary and Charlie, as well as the twins, their mother Violet, and their father (also named Charlie) are all buried in Chingford Mount Cemetery.
Charlie's grandson Joseph Jones, Nancy's son, and Nancy's ex-husband Norman Jones were convicted in 2009 and jailed for life in the death of John Finney, who was discovered dead and dismembered in 2008 in Ickleford. Finney's head and hands have never been found.
An article published a few weeks ago about the closure of HMP Shepton Mallet prison in Somerset, which was built in 1610 and up until its closing was Britain's oldest working prison, mentioned that two of its most famous inmates were Ronnie and Reggie Kray. The prison was one of six closures announced at the beginning of the year in an effort to make budget cuts.
Charlie Kray was actually an inmate at Parkhurst when he died. Kray was taken from the prison to hospital on the Isle of Wight after having chest pains, and died soon after.