Tina Knowles never misses a chance to brag about her grandchildren, and the glowing grandma recently beamed as she spilled fun facts about Beyoncé and Jay Z‘s children, Blue Ivy, Rumi, and Sir. Source: Axelle/Bauer-Griffin/FilmMagic/Kevin Mazur/Getty Images for Roc Nation / Getty Like most grandmothers, Knowles is heavily involved in her grandchildren’s lives and she […]