Northern Territory Attorney-General Natasha Fyles will take four weeks off work to help her seven-year-old son fight a rare spinal cord tumour in the United States.
Ms Fyles, who is also the territory's health minister, will travel with her partner to the US so her son Henry can receive specialised treatment.
Henry's tumour, which is inside the spinal cord, is very rare in children under the age of 10.
The family has previously sought treatment in the US, where surgeons have the necessary expertise.
Ms Fyles said she is grateful for the support shown by the community, but has asked for privacy.
Her four weeks of leave will begin on Monday.
Chief Minister Michael Gunner will act as Minister for Health and Minister for Disabilities in her stead, while local government minister Gerry McCarthy will act as Attorney-General and Minister for Justice.
Australian Associated Press