You should behave towards Bharata as one should towards one's king. Kings (although juveline), are really senior by virtue of their royalty; and do you remember the duties touching sovereigns.
कुमारे भरते वृत्तिर्वर्तितव्या च राजवत्। अप्यज्येष्ठा हि राजानो राजधर्ममनुस्मर॥