They're all described as Caucasian, with slim builds and brown hair.
Police said the children were taken from a property on Maraju Yakapari Road at The Leap about 11:30am on Thursday.
They're believed to be with a 28-year-old man, last seen heading towards the Bruce Highway in Mackay in a white 2005 Nissan Patrol 4WD with licence plates 063-BC9.
The man, Joshua Carter of The Leap, is described as Caucasian in appearance, of solid build and about 175 centimetres tall.
Carter is described as having a shaven head and full bushy beard with multiple face and body tattoos, including batman ‘joker’ themed facial tattoos.
Anyone with information should call 131 564, or TRIPLE ZERO for life threatening matters.
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