The community of Carbis Bay is still coming to terms with the grim discovery at the bungalow of Jonathan and Derisa Trenchard earlier this month.
One of their three sons Joel, who is thirteen, has just returned to St. Ives School, his two older brothers are former pupils.
ITV News Westcountry's Steve Hardy has the full report.
More top news
An international team will independently identify the substance that poisoned Dawn Sturgess and Charlie Rowley
A year on since flash flooding hit the Cornish village of Coverack, some residents are still living with the devastation
It will be clear across most of the region throughout the day with bright spells and a few scattered showers.