The BBC reported the mother Elsie Urry had said McGreavy – dubbed the Monster of Worcester – had been freed. He was cleared for release by the parole board last December, after three members said he is no longer a “significant risk”.
Mrs Urry has previously told the BBC: “There are people in prison who have done murders, not half as bad as what he’s done, and yet they haven’t been put up for parole, so why should he get it?”
McGreavy, 21 at the time of the killings, was lodging at the family’s home where he occasionally cooked and looked after the children while their parents were at work.
But horror struck on Friday April 13 1973 when the children’s dad Clive went to collect their mum from the pub where she worked as a barmaid, leaving McGreavy to look after the youngsters.
But McGreavy, who had drunk between five and seven pints of beer, was unable to stop baby Samantha crying and flew into a drunken rage.
He later said he put his hand over her mouth to shut her her up, left it there, and “that was it”.
McGreavy then went on his bloodthirst killing spree, strangling four-year-old Paul with a wire before slitting two-year-old Dawn’s throat.
He then smashed Samantha’s skull and went into the cellar and got a pitchfork with which he mutilated the three dead children.
Then he took them into the garden and rammed their bodies onto the iron railings between two back gardens before walking out.
He was eventually found wandering the streets of Worcester by police.
When asked why he had killed the three innocent children, McGreavy replied: “That is what I have been trying to figure out.”
He pleaded guilty to their murders in a hearing that lasted just eight minutes. Most of his sentence has been served with him under protection as he has been subject to abuse from other prisoners.
The killer applied for parole at least nine times before finally being released. In 2006 he was transferred to an open prison and allowed to stay at a bail hostel in Liverpool on temporary licence – but was sent back when the public found out he was allowed to roam virtually free.
Ms Urry told the BBC: “They said he was going in for life and then they changed it for a minimum of 20 years, but he hasn’t done 60 years.
“He took three lives, not just one or two – three.”