Husband's online loan is overdue and there is no money to pay back. Call your child's school, will you know the school?
No, the collector can't contact any relatives and friends of the debtor, let alone the children's school. If the collector does this, you have to collect evidence, call the police directly or sue the court directly, because it is suspected of privacy leakage and has a serious impact on your reputation. This is an illegal act.