1. Why Prahlada was an authority on devotional service

    Prahlada Maharaja was an authority in the devotional service of the Lord because he had his father killed by Lord Nrsimha-deva, setting the example that even a father should be removed from the path of devotional service if such a father happens to be an obstacle.

    From Srila Prabhupada’s purport to SB 1.12.25