Sefer Chasidim Siman 561
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האב המצוה לבנו לתת גט לאשתו שלא מצא בה ערות דבר אלא על חנם על זה אינו מצווה הבן לעשות רצון אביו כשהאשה טובה ואינה מכעסת את בעלה ולא אביו ואמו:
Medieval Jewish mysticism, translated by Sholom Alchanan Singer. Northbrook, Ill. Whitehall Co., 1971
A father who commends his son to give a bill of divorce to his wife, and he did not find any iniquity in her, but wants this just for no reason - his son is not obligated to hearken to his word if the woman is good and does not angry neither her husband, nor his father and mother.