Two devout evangelical Christians whose 10-year-old son is in an intensive care unit after being diagnosed with a brain tumour are embroiled in a High Court treatment battle with doctors.
Specialists want a judge to allow them to limit the treatment they provide to the youngster, who was diagnosed with a tumour in 2015.
They say the boy cannot recover and should be made as comfortable as possible and not subjected to further "invasive" procedures.
The boy's parents, who are separated, disagree and say doctors should not limit treatment options.
They "lavish" the youngster with love and play gospel music and preaching to him, a court has heard.
The judge began considering evidence at a hearing in the Family Division of the High Court in London on Tuesday.
A lawyer representing the boy's parents told Mr Justice Holman that life was "precarious and uncertain".
Barrister Ashitey Ollennu suggested that people sometimes made unexpected recoveries.
He said the boy's parents thought there were "things that could be done" and that doctors were "giving up".
The boy's parents thought the youngster had laughed and appeared to be "moving to exultations", he said.
A consultant overseeing the boy's care said he had no purposeful movements, was thought to be blind, and was existing not living.
