Nicholas Prosper was jailed in March for the murders of his mother, brother and sister in Luton in September 2024.

Triple murderer Nicholas Prosper should be given a whole-life order for the “exceptional” killings of his mother and two siblings, the Court of Appeal has heard.

Her case, unsettling and unprecedented, has reignited a long-standing American impulse: to place legal blame on parents for the crimes of their children. But this instinct, however emotionally ...