Whanau sat close to the casket throughout the hour-long service. Brendon was the son of Mihi Thompson and Hayes Garland.
During the service, Brendon's Wanganui East School teacher Sarah Lourie spoke, saying teachers were always told not to get emotionally involved with their students.
"Well, that completely went out the window the day Brendon arrived in my class in 2011. He made such an impact on all of us. He wanted us all to know about his journey, his trips to Starship Hospital in Auckland, the people and other kids he had met ... he never, ever complained.
"Brendon was always bright and cheerful, we all loved him."
Ms Lourie said helping Brendon with his bucket list was special and every spectacular activity had been celebrated by the whole class with him.
"I told my students this morning they were too young to have lost a classmate, especially our wonderful Brendon."
A family member said Brendon's big, warm smile would ever be remembered.
"You were our boy, you brought us all together, you united us all ... thank you, Brendon."
Brendon was taken to his final resting place at the Aramoho Cemetery.