Early reports noted a 10-year-old girl and a six-year-old boy were observed most recently in the vicinity of Mirambeena Drive in Pimpama at approximately 8:50 AM on July 18.
Both children are characterized as Caucasian, possessing brown hair and brown eyes.
Currently, authorities have also distributed an image of a seven-week-old baby girl who is missing.
Another image is of 41-year-old Monique, who the children are believed to be with.
The children are known to her.
Monique is described as Caucasian, with dark brown hair and brown eyes.
They are believed to be travelling in a white Nissan X-Trail with Queensland registration 992XPS.
Police believe the group may be in the Tenterfield area of New South Wales.
Police are urging Monique to come forward and contact Policelink on 131 444.
Anyone who may have seen them or the car is also urged to contact police.
