Watch A Sister's Grudge (2021) HD Full Movie Free on solarmovie.do. Watch A Sister's Grudge (2021) online free. Family dynamics take a messy turn when a woman learns she has a half sister at her mother's funeral....Family dynamics take a messy turn when a woman learns she has a half sister at her mother's funeral. As her perfect life starts to unravel, she suspects her new sister is to blame for her Mom's death.