The attack happened last month at the family home on the outskirts of Waterford in the Republic of Ireland.
World News
Elliot English died on Friday from injuries sustained in fire in Waterford that also claimed lives of his parents
Business & Economy
Four people died after their home in Birch Avenue, on the outskirts of Waterford, was set on fire earlier this month.
Technology
Three people - two women and one man - have been released, and one person remains in custody, gardaí say.