childrens bank account

can the dad obtain copies of his children's bank statements under 16? As a joint bank account ex shows monies going into the account.
Asked on questionnaire for their bank statements to be given and judge refused.

If you're not named on the account then not if the judge has refused their disclosure.

What relevance do they have?

monies from joint account held with former spouse was being paid into their accounts without my knowledge. Within my questionnaire I gave their account details of the dates and amounts, judge said no, is their a redress