The Sun (Surya) represents the ego, authority, and the father. Saturn (Shani) represents restriction, criticism, and the son. These two planets are bitter mythological enemies.
When they sit together in a birth chart, it creates a massive internal ego complex. Dr. Sharma reveals how this manifests in a marriage: The person will constantly nag, criticize, and correct their spouse over trivial things ("biwi ko baar baar tokta").
Why do they do this? Because deep down, the Sun-Saturn clash makes them feel disrespected. They are obsessed with demanding "izzat" (respect) from their partner, and they use criticism as a toxic way to establish their authority.