National Siblings Day: Watch these free movies about family with your brothers and sisters By Catherine Park FILE - Brother and sister hold each other on March 29, 2021, in London, England. Take a few hours to stop fighting with your siblings and instead mark National Siblings Day with them by watching a few movies that will make you remember why it might not be so bad having them around. National Siblings Day is on April 10, and Tubi has a plethora of free family-themed movies that will make you laugh, cry and everything in between. Celebrate the people who share all of life’s most memorable moments — from the most embarrassing, to the most heartbreaking, to the happiest — through movies that showcase the bond that can only be created with a sister or brother.