A ‘last ditch’ effort to find missing Canadian siblings, Jack and Lilly Sullivan, is set for November ahead of the winter, as theories continue to pour in over their mysterious disappearance.

The frantic hunt for four-year-old Jack and six-year-old Lilly began after their mother, Malehya Brooks-Murray, reported they had vanished from their home in Lansdowne Station, Pictou County, Nova Scotia, on May 2, believing they had wandered out of the property.

Almost six months later, the pair are still missing and the approaching cold weather sees hope for their return dwindling.

‘As a mother I love my children more than life itself and feel so heart broken not being able to hold my two children Lilly and Jack,’ Brooks-Murray wrote on Facebook on October 13.

‘The longing I have for them to come home back to me is a greater feeling than I could never imagine… There is not one single day, minute or second that goes by that I am not thinking about my children.’

Canadian organization Please Bring Me Home is rallying for volunteers to help with the November 15 search.

Nick Oldrieve, executive director of Please Bring Me Home, told the Daily Mail that they typically don’t get involved in such early stages of missing persons cases.

‘But we feel like there is something we can do to assist because, and it’s likely the last ditch effort for these kids before snowfall hits,’ Oldrieve said.

Nick Oldrieve, executive director of Please Bring Me Home, told the Daily Mail that teams will be scouring the low level waters in the area for any sign of the siblings. A Please Bring Me Home search for missing persons

Searchers return after looking for Jack and Lilly just a week since their disappearance in May

‘As fellow Canadians and as a group who run searches for missing people, we offer our group to come and assist. We’ve been on searches before and had successes.’

Oldrieve said the organization was contacted by the children’s paternal grandmother, Belynda Gray, as well as ‘associates’ of their mother, Brooks-Murray.

He noted that the Royal Canadian Mounted Police (RCMP) is set to continue searching in ‘full force’ come spring as the season is ‘bar none’ the ‘best time to search for anybody.’

Theories on the children’s disappearance have swirled online, with their grandmother even believing that her ‘heart tells me these babies are gone.’

However, Oldrieve said his team are focusing on the ‘misadventure’ theory that the kids wandered off from the home they shared with their mom, stepfather Daniel Martell, and little sister Meadow but noted that ‘we’re not too sure exactly what happened here.’

‘At this time we’re only involved from a wandering slash misadventure search effort. And that involves waterways,’ he said.

‘So ponds, lakes, standing water, and creeks, have to be revisited,’ he added.He said that the low water levels will help reveal more to the search teams as they are expected to be scouring around a little more than three miles.

Theories on the children’s disappearance have swirled online, with their grandmother even believing that her ‘heart tells me these babies are gone’

Oldrieve said their main goals during the search will be ‘scanning the ground for any clothing items or anything that could be Jack and Lilly Sullivan’

‘We like to sit around five kilometers because it ensures that you’re not rushing it, and you’re not going to miss anything,’ he said.

Oldrieve said, along with his team, they have invited volunteers and members of the public to scour land near the children’s home.

‘I think that the public is just itching to get involved, and it’s going to give an opportunity for community members to come together, assist in the effort in an organized fashion,’ he continued.

Search groups are expected to consist of around ten people, led by a person with experience in emergency response or similar search efforts.

Oldrieve said their main goals during the search will be ‘scanning the ground for any clothing items or anything that could be Jack and Lilly Sullivan.’

He added: ‘I just caution people to, if they’re going to be coming to the search, it is not to try and get information out of anybody about possible foul play stuff. We’re looking for misadventure and wandering. That’s the theory we’re focused on that day.’

Oldrieve’s caution during the search efforts comes after different theories have spiraled online over the children’s disappearance.

This has deepened after this week it emerged that on the night of the children’s disappearance, two neighbors reported hearing a vehicle coming and going in the middle of the night.

On the night of the children’s disappearance, two neighbors reported hearing a vehicle coming and going in the middle of the night

Oldrieve said their organization was contacted by the children’s paternal grandmother, Belynda Gray, as well as ‘associates’ of their mother, Brooks-Murray. Pictured: A previous search by the Please Bring Me Home team

While RCMP confirmed to CBC that after ‘thorough review of surveillance footage’ they found ‘no evidence of any vehicle activity at this time.’

‘No driver has been identified, and the presence of a vehicle has not been substantiated as a key element in the investigation,’ RCMP communications adviser Allison Gerrard told the outlet.

Gerrard said witnesses reported hearing a vehicle, but weren’t able to confirm ever seeing one on the night in question.

According to court documents obtained by CBC, two constables conversed with nearby neighbor Brad Wong on May 9.

Wong said he had heard a ‘loud vehicle’ coming and going around the area in the early hours of the morning on May 2, the day the children were reported missing.

RCMP Corporal Charlene Curl wrote that Wong ‘said his residence is elevated from Daniel’s [Martell] residence and he could see vehicle lights over the treetops.’

‘He said the vehicle left three or four times after midnight and into the early hours of the morning. He said the vehicle would drive off in the distance and he could hear it stop and then return. He said it remained in earshot the entire time,’ court documents stated, CBC reported.Another nearby resident, Justin Smith, told investigators on May 17 that he heard a vehicle on Highway 289 turn around by railroad tracks near an intersection close to the children’s home around 1.30am.

The children’s mother, Brooks-Murray, wrote: ‘I will never stop searching for my children until they are found and brought home safe and sound. Someone, somewhere, knows something so please bring my babies home’

The constable who took Smith’s statement wrote that the vehicle ‘made noise then went quiet’ for around two minutes then drove on, CBC reported.

‘[Smith] later spoke with Brad Wong who informed him Daniel’s vehicle came and went five or six times that night. Wong said the car Smith heard was Daniel,’ the constable added.

Martell told police that he had gone to bed ‘fairly early’ and didn’t wake up until the next morning.

Brooks-Murray said that Martell had stayed up to clean the home, but it wasn’t clean when she got up so she ‘doesn’t know what he did,’ CBC reported.

‘Malehya said she was not woken up throughout the night, and does not know when Martell came to bed,’ the filing said., according to the outlet.

Martell told police no one left their home that night and they had no visitors.

RCMP said cadaver dogs were used to search the area, but they did not find anything.

Staff Sargent Rob McCamon told the outlet that it is still being treated as a missing persons’ case, and no criminal activity has been found at this time.

Staff Sargent Rob McCamon said that it is still being treated as a missing persons’ case

Brooks-Murray wrote on Facebook: ‘I will never stop searching for my children until they are found and brought home safe and sound. Someone, somewhere, knows something so please bring my babies home.

‘To the incredible volunteers, searchers, investigators and compassionate strangers who have stood beside us – Thank you.’

Daily Mail has reached out to RCMP, Brooks-Murray and Martell for further comment.