Craig Nunn, 40, initially denied killing little Harley Thomas Wilkinson when he crashed his black Ford Focus on the A451 between Kidderminster and Stourpourt.
Imogen Nunn, 25 - known as Deaf Immy on the social media platform where she highlighted hearing and mental health issues - had sourced a 'suicide kit' online.
Christopher Nunn, 42, of Beccles, Suffolk, is accused of the theft of high-value titles from LexisNexis which publishes specialist legal, tax and accountancy books.
Shirley Nunn, 67, and her son Steven, 50, were found dead at home in Middlesbrough by a family member in October 2021, two years to the day after Ms Nunn's husband Paul also died of cancer.