Entertainment 5 Year-Old Blue Ivy Writes Letter To Her Grandma And Mum, Beyonce By PublishedMarch 19, 2018 5-year-old Blue Ivy wrote a very beautiful letter to her grandmother (Jay-Z’s mum) and to her mother Beyonce. Related posts: Beyonce Looks Amazing With Blue Ivy Beyonce Looks Pregnant As She Steps Out With Jay Z And Blue Ivy Blue Ivy Has Her Personal Stylist 72 Year Old Grandma Laments Husband’s Visa Denial