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Emma Tustin, 32, killed Arthur Labinjo-Hughes by repeatedly slamming his head on a hard surface after she and 29-year-old Thomas Hughes starved the youngster and poisoned him with salt.
Arthur's maternal grandmother Madelaine Halcrow told MailOnline: 'Arthur was let down by social services and the West Midlands Police.'
The heart-wrenching clip, captured on CCTV at the family home in Solihull, shows an emaciated Arthur Labinjo-Hughes, whose pyjamas appear to be hanging off him, grimacing in pain.
Arthur's grandmother read a tribute from his mother Olivia who is currently in prison paying tribute to her son who loved Birmingham City, reading Julia Donaldson books and superheroes
Full details of Arthur's horrific childhood, raised by his alcoholic mother, were revealed during the murder trial of Thomas Hughes, 29, and 32-year-old partner Emma Tustin at Coventry Crown Court.