Police have appealed for public help to find a man, a mother and her two children who have been missing from the Miranda area since Thursday.
Luke and Hayleigh Smith, aged 11 and 12, left a home on Willarong Road, Caringbah South about 4.30pm.
They haven’t been seen or heard from since and police hold serious concerns for their welfare.
It is believed they may be travelling with their mother, Nicole Boyle, 36, and a man, Neville Kerslake, aged 50.
Luke Smith, 11, is described as being of Caucasian appearance, of thin build and about 105cm tall.
Hayleigh Smith, 12, is Caucasian, of very thin build and about 150cm tall.
Nicole Boyle is described as being of Caucasian appearance, of large build and about 155cm tall. She has brown eyes and brown hair.
Neville Kerslake is of Caucasian appearance, of medium build and about 175cm tall. He has brown eyes with grey hair.
Police have information they may be travelling in a blue 2005 Ford Falcon with NSW registration DNJ 48E.
They may be in the southern part of NSW.
Police are asking the public to be on alert and report any sightings of the children, woman, man or vehicle.
Call Triple Zero to provide any information.