Popsugar Celebrity Oscars Who Was Joaquin Phoenix's Brother, River? How Joaquin Phoenix Paid Tribute to His Late Brother River During His Oscars Speech 10 February 2020 by Amanda Prahl View On One Page Photo 6 of 7 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 6 Previous Next Start Slideshow Award SeasonNostalgiaMoviesOscarsJoaquin Phoenix