Keeping child’s terminal illness from them

So I started binge watching The Good Doctor (10/10 recommend), and in one episode a doctor discovers terminal cancer in a 12-year-old patient. When he tells the parents, they tell him they already knew and 7 months ago he was given 1 year to live. They asked him to keep the information from their son, saying it’s better that he doesn’t know.

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Some things to think about . . .

— the child is a minor

— parent’s argument is they want their son to enjoy the rest of the time he has and live his life to the fullest without the stress of knowing of his condition

— opposing argument is the child deserves to know the truth

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What are your overall thoughts? Is this unethical? What would you do?