Brad Pitt and Angelina Jolie have been awarded joint custody following a protracted court battle.
Jolie and Pitt married in 2014 after meeting some nine years earlier, on the set of Mr and Mrs Smith.
In 2020 Jolie made a bid to disqualify Ouderkirk from the case and on Monday criticised his decision not to allow the children to testify.
The former couple have been in dispute for five years over access to their six children and hired a private judge, John Ouderkirk, to oversee the case.