Four year-old Noah Barthe and his six year-old brother Connor were found dead on Monday morning after a 45-kilogram African rock python escaped its enclosure in the apartment, which is above an exotic pet store.
Preliminary autopsy results show the boys died of asphyxiation.
Campbellton's deputy mayor, Ian Comeau, says the brothers will be buried together in one casket and that the service will celebrate their short lives. The funeral will be held at St. Thomas Aquinas Roman Catholic Church.
Both the apartment and store are owned by Jean-Claude Savoie, a family friend, who took the boys shopping and to a farm before hosting a sleepover on Sunday with his son.