Leonardo DiCaprio's Onscreen Son Forrest Goodluck on How Leo "Completely Changes" on Set

</a><p>Forrest Goodluck had a breakout role as Leonardo DiCaprio</a>'s son in The Revenant. When we caught up with him on the Oscars red carpet, he told us why Leo's become a mentor to him - and how he "completely changes" on set. </p>