Nova Scotia’s child protection agency investigated the living conditions of Jack and Lilly Sullivan months before their mysterious disappearance from a rural part of the province in early May – a case file that has been reviewed by the minister responsible for child welfare.

Scott Armstrong, Nova Scotia’s Minister of Opportunities and Social Development, confirmed in an interview that the agency had a file on the children prior to their disappearance, but said it would be inappropriate for him to discuss the agency’s findings.

With Jack and Lilly still missing and a police investigation under way, it’s not the right time to dissect the agency’s prior involvement, Mr. Armstrong said.

“We have no idea where those kids are and we should be focused on helping them and finding them and supporting this family,” he said.

Asked whether a review has been ordered into his agency’s prior interaction with the children, he said: “As minister, I’ve seen a report. I’ll talk to that. I’ve personally seen the report. I asked for it,” he said. “I’m aware of how our department was involved in this.”

He added: “I think we should be focused more on those kids than we are on looking to blame somebody.”

Mr. Armstrong said there may come a point when the agency’s involvement with the children is deserving of more scrutiny, but now – seven weeks into their disappearance – is not it.

Daniel Martell, who was in a common-law relationship with the children’s mother and was living with them when they went missing, told The Globe and Mail in an interview in May that a social worker with child protective services visited the home several months ago. The visit was prompted by concerns that had been relayed by someone at the children’s school and related to their developmental delays, Mr. Martell said.

The children’s mother, Malehya Brooks-Murray, said she had “no comment” in relation to child protective services’ involvement with Lilly and Jack.

Mr. Martell has said he had nothing to do with the children’s disappearance and has nothing to hide. “I’m keeping the story alive and keeping everyone’s hopes up, not just my own,” Mr. Martell told The Globe in May. He also said Ms. Brooks-Murray had no involvement in the disappearance: “I know Malehya has nothing to do with anything.”

Child welfare authorities investigate when a report of suspected abuse or neglect is received by the agency. In Nova Scotia, every person has a legal obligation to report concerns of suspected abuse or neglect of a child. The law stipulates that teachers and other child-care workers have an added duty to report.

The disappearance of Jack and Lilly has prompted one of the largest ground searches in the province’s history.

Ms. Brooks-Murray told police that Lilly, 6, and Jack, 4, wandered away from their home in Lansdowne on May 2 while she and Mr. Martell, her then-common-law partner, were sleeping. Earlier that same morning, around 6:15 a.m., she reported both children would be absent from school, according to Mr. Martell. He told The Globe that Lilly had a cough and Jack was kept home as a precaution.

The RCMP’s major crime division, involved since Day 2 of the search, has since seized electronic devices from the children’s home, conducted polygraph tests, analyzed hours of video footage from the road outside their residence, and searched septic systems and abandoned mineshafts in the area. So far, the children appear to have disappeared without a trace. The division, whose primary role is to investigate foul play and homicides, has repeatedly said there is no evidence the children were abducted.

The day after the children were reported missing, Ms. Brooks-Murray left her home in Lansdowne. She cut off contact with Mr. Martell and later changed her Facebook status to single.

Nova Scotia and Ontario are the only two provinces without a Child and Youth Advocate. Both provinces rely on provincial ombudsmen to impartially investigate complaints related to child welfare; however, those watchdogs are also responsible for reviewing many other agencies and departments.

The role of a Child and Youth Advocate is dedicated to advocating for and protecting the rights of children. The office may also review and investigate deaths or injuries of children receiving government services.

More than a year ago, Nova Scotia’s Progressive Conservative government introduced legislation to create a dedicated office that would be an independent voice for the rights of children, but the initiative has not moved forward.

Mr. Armstrong said he is “personally committed” to creating such an office, and hopes to be able to share more details in the fall. The minister also said his department is taking steps to reduce the workload of child welfare staff, including improving recruitment efforts for new social workers and adding administrative roles to reduce paperwork done by front-line employees.

On Thursday, the province announced a reward of up to $150,000 for anyone who comes forward with information about the missing children.