It has emerged that a young woman with intellectual disabilities continued to visit the 'Grace' foster home in the southeast up until 2015.
The issue was raised last night during a Dáil debate on the terms of reference for a commission of investigation into the case.
The woman, known by the pseudonym 'Anne', availed of weekend respite services, by private arrangement, at the foster home for a number of years.
This continued up to 2013 when the Health Service Investigates formally demanded that the foster family cease all care activity and the HSE told Anne's family that the private respite placement must stop.
However, RTÉ Investigates understands that Anne's family was never told of the reason for this decision and the HSE did not inform the family of the concerns of sexual abuse at the foster home.
In October 2013, Anne moved to a different service provider on a full-time seven-day residential placement but she returned home on alternate weekends to spend time with her family.
Anne's family remained friendly with the foster family in the southeast and they continued to occasionally visit the foster family bringing Anne with them on those visits.
RTÉ understands that when the RTÉ Investigates programme 'Duty of Care' aired in April 2015 and Grace's story was brought to public attention for the first time, Anne's family saw the report and stopped visiting the foster family.
A HSE spokesperson has told RTÉ that in 2015, Anne's current service provider became concerned that she may have been meeting with the former foster family in the southeast when at home at weekends.
These concerns were reported to HIQA, the child and family agency Tusla and the HSE.
The local disability team commissioned a review specific to the concerns. In addition, an assurance review was commissioned by the National Social Care Division to review these circumstances and the safeguarding processes in place.
As part of this process, the assurance team reviewed correspondence from Anne's family to the local HSE disability team received in September 2015 which stated that Anne has not met with the former foster family in the southeast since April 2015.
The spokesperson also says the HSE was asked by gardaí not to reveal details of the allegations of sexual abuse to Anne's family.
The spokesperson said that the HSE does not have a legal basis to force people to stop private respite placements.
In a statement to RTÉ, An Garda Síochána said: "As such matters may be examined by a Commission of Investigation we are precluded from comment."
It has further emerged that the two whistleblowers at the centre of the 'Grace' case have made a representation to the Minister for Disabilities Finian McGrath to have the terms of reference for the Commission of Investigation altered.
It follows calls yesterday by a wider group of families whose loved ones spent time in the foster home to expand the investigation, saying they are extremely disappointed their cases will not be looked at as part of the current inquiry.
The two whistleblowers, who cannot be identified in order to protect the identity of Grace, say they have "grave concerns" as regards the scope of the terms of reference.
They had hoped Minister McGrath would adopt the recommendations of the Government commissioned report carried out by Senior Counsel Conor Dignam but they say a number of those recommendations have not been fully accepted, nor has any explanation been provided as to why this is the case.
The changes relate in particular to a number of key timelines, including a recommendation by Mr Dignam that the terms of reference should examine whether there was any deliberate suppression of information in Grace's case from 1996 to 2016 but the terms of reference brought to Cabinet yesterday only recommend that the period July 2009 to March 2016 be investigated.
They are also dissatisfied that the terms of reference do not include provision to look at their treatment by the HSE and the protected disclosures they made.
The two whistleblowers say they feel the omission of what they deem to be key issues represents a further attempt to belittle their involvement in the entire matter and equates to sweeping their complaints under the carpet.