Beyoncé and Jay-Z were reportedly worried that their 5-year-old daughter Blue Ivy would ''feel left out'' after the June 13 birth of her twin siblings Sir and Rumi, but it turns out there was nothing to worry about. Blue Ivy has completely bonded with her brother and sister, a source tells PEOPLE. “Beyoncé has been very busy with the newborns, but she’s also been able to relax a bit. It’s helped her that Blue has been such an amazing big sister,” adds the source. Before the babies arrived, the new mom of three “made sure to spend lots of quality time” with Blue.