According to Courier Mail, the police allege that the child had significant internal injuries.
Investigations are ongoing although, according to the couple, Sinclair is said to have fell off the staircase while playing with his sibling.
They supposed that the injuries were not that serious and gave the boy some analgesics and had him retire to bed but the boy illness deteriorated and tis’ then his parents called for medics who were unable to resuscitate the boy, he died.