A son inherits the disposition of either the father or the mother. Sometimes he inherits the dispositions of both. A person of impure birth can never succeed in concealing his true nature.
पित्र्यं वा भजते शीलं मातृजं वा तथोभयम्। न कथंचन संकीर्णः प्रकृतिं स्वां नियच्छति॥