Because of the different purposes of section 513 and of the Probate Act's provision for appointment of a guardian, a child could be disabled within the meaning of section 513 and not be disabled within the meaning of the Probate Act. For example, a child could become temporarily physically disabled one day before his 18 th birthday and not be able to support himself but still able to manage his estate and financial affairs. 198 Ill. App. We conclude that a probate court's determination of disability is not required by section 513 and that a domestic relations judge has the power to make a determination of disability pursuant to a section 513 petition. Petitioner also argues that the trial court erred in not enforcing the prior order of support that it did not find void.
Petitioner is correct.
Even if the order was not binding on Andrew, it was binding on respondent to pay petitioner for Andrew's support. Petitioner also argues that Andrew was not a necessary party to the proceedings on her petition. There is authority that an order entered by a court without jurisdiction over a necessary party is void. 215 Ill. App. It has also been stated that the issue of nonjoinder of necessary parties can be raised for the first time on appeal.