Lucas Singh lost his fight for life three days before Christmas.
The 13-year-old had been on a life support machine for several weeks after undergoing complex heart surgery in November.
The year 9 student died on December 22
Cason Hallwood died suddenly on Christmas Day after enjoying spending time with his family.
It is believed the 12-year-old, who is asthmatic and has a nut allergy, may have died following an allergic reaction.
The year 8 student had been playing with his three brothers, twins Cowen and Corley, 18, and Caiden, 13 before he went out to play with friends in Wharton Recreation Park.
Cason Hallwood, second from right, with mum Louise and brothers on Christmas Day