Karl's family were quick to respond, telling Nine's Fix, 'We are disappointed Cass would claim such inflammatory suggestions that we have alienated Karl’s children from our family,' they told Nine.
'Nothing could be further from the truth. Karl regularly co-parents his children and has his loving family around them.
'We refuse to keep a running dialogue of the children. There are custody and financial matters before the Family Court and Karl has abided by every single one of them and we will not jeopardise it. Family is often compromised when parents go through a painful divorce and we do our best to continue our love and support for the children.'
Now, Cassandra has responded once again.
In an Instagram post from last week, Cassandra announced the launch of her first children’s book Leo Lion’s Big Bed and the caption took another swipe at her ex.
‘Profits are going to an organisation that helps to ensure children are prioritised in divorce,’ she wrote, in a move said to have disappointed Karl.
Karl is yet to respond to Cass' most recent jab.
The couple share three children - Jackson, 18, Ava, 13, and River, 11.