Jaime King and Kyle Newman’s former nanny is set to testify in the former couple’s custody battle over their sons. The pair are parents to James, eight, and Leo, six and they have been at odds over their parenting arrangements since 2020 when Kyle filed documents requesting they live with him full time and now the former couple are preparing to testify in court along with their ex-nanny Olivia Messier. Documents obtained by People.com show Olivia will be asked to testify as to “what she personally observed with regards to her care and supervision of the minor children as well as her interactio…