Parents have been living in a "complete nightmare" since discovering their children are being treated at the same Londonderry health facility as two serial paedophile brothers.
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Families of patients at Lakeview in the Gransha psychiatric hospital complex are now uniting in a bid to see James and Owen Roe McDermott removed.
"I'm very determined and so are all the families," Margaret Pollock, whose daughter Michelle is a Lakeview patient, told UTV.
"I will do anything in my power to have them moved out - there's going to be no compromises."
The McDermott brothers have been at the centre of controversy for a number of weeks, after they were declared mentally unfit to stand trial over a wake of child sex abuse in their home village of Donagh in Co Tyrone.
The pair - and two other brothers - were behind a catalogue of offences against children there over a 30-year period. But there was shock when James and Owen Roe McDermott returned home.
Following appeals from the Western Health Trust for the brothers to admit themselves for treatment, they voluntarily moved to Lakeview.
Mrs Pollock's daughter Michelle is said to be very vulnerable with autistic tendancies.
Her mother was appalled to find her in the same sitting room as one of the McDermotts during visiting hours on Sunday.
"My daughter has not committed any offences in the eyes of the law and these men have committed offences," she said.
"That is not the place for them and we would like them moved out."
When asked how she felt the patients' families had been treated by the Western Health Trust, Mrs Pollock told UTV: "We haven't been treated at all.
"We should have been consulted before there was any placement of the men in Lakeview, but communications have broken down - and with bad communications, you get bad relations."
Teresa McGuinness, whose son Colm is also a Lakeview patient, said the situation had had a devastating effect on her family. But she added that shock had turned to anger.
"We're expecting a meeting (with the Trust) on Friday - they'll already have been on the ward eight days," she told UTV.
Mrs McGuinness also described the moment she encountered one of the McDermott brothers.
"One of them winked at me and laughed and spoke," she said.
"It sent a chill down my spine.
"It's very disturbing to have to be in close contact - even the families shouldn't have to go through that."
The families are set to meet with the Western Health Trust on Friday, when it is understood senior management will outline what safeguards have been taken.
However, the families insist they will not rest until the McDermott brothers have been removed from Lakeview.
"They should never have been there in the first place - but after all, they need care and they have human rights the same as my son or any other patient," said Mrs McGuinness.
"They need care, they need looked after. But in the right environment."
© UTV News