Reference for Gittin 103:20

משוך פירי מיתמי אייקור היינו דרב חנילאי בר אידי זול לא יהא כח הדיוט חמור מהקדש

The guardian must give an account of his guardianship at its close. Rabban Simeon b. Gamaliel, however, says that this is not necessary. Women, slaves and minors should not be made guardians: if, however, the father of the orphans chooses to appoint one, he is at liberty to do so.'

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