Hope Finesse, 49, and her sons Ben Mackonis, 22, and Sam Mackonis, 19, have not been seen or heard from from since about 7.30pm last night.
They were last seen in Ngunnawal in the Gungahlin district in Canberra.
The trio do not have access to mobile phones or money and are believed to be travelling in a silver Toyota Rav4 with the registration of YGL 25N.
The car has significant hail damage.
It was last seen driving at the intersection of Kuringa Drive and the Barton Highway, and may have been heading towards the Brindabellas.
Their family and police hold serious concerns for their welfare and are urgently calling for public assistance in locating them or their car.
Anybody with information is urged to contact police on 131 444.
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