When the traditional guru and guardians are found to be unfavorable, they too must surely be abandoned—

One who cannot save other souls from the world of impending death—that is, one who cannot teach the path of devotion—he cannot be a teacher, although he may be called ‘guru’; he cannot be a relative—he is not worthy of the designation; he cannot be a father—he is not qualified to beget a son; she cannot be a mother—she should not bear a child; he cannot be a god—the demigods who cannot deliver others from material bondage are not entitled to accept worship from human society; and he cannot be a husband—his hand is not fit to accept in marriage.

—Śrī Ṛṣabhadev

[from Srila Bhakti Rakshak Sridhar Dev-goswami Maharaja, Sri Sri Prapanna-jivanamrtam 4.5]
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