In any suit or proceeding under this article the court shall have jurisdiction to hear, decide and dispose of any matter which involves the property or welfare of any person under legal disability who may be a party to a suit or proceeding, which matter, but for this section, would otherwise be the subject of a separate suit, or suits, under section thirteen, article ten, chapter forty-four of this code. Rules of equity governing service of process generally shall apply to all proceedings under this article, and section seven of this article shall not require the investment of funds of any person under disability in those cases where such funds, as a result of the court's action, may not be available for such purpose.