Last week a video went viral of 4 year old McKenna StanChak serenading her mom, who has been battling STAGE 4 cancer since 2013, with Martina McBride’s I’M GONNA LOVE YOU THROUGH IT. Well, THIS week Ellen Degeneres invited McKenna, her mom AND Martina McBride to be on the Ellen show so McKenna could sing to her mom WITH Martina! Grab a tissue and watch their duet…