Magdalena Larkin (played by Belita Moreno) is the mortal mother of Theresa Russo (nee Larkin) and the maternal grandmother of Justin, Alex, and Max Russo, as well as the mother-in-law of Jerry Russo. She only appeared in the episode Quinceañera to attend Alex's 15th birthday party. Justin and Max are very close to her because they like to wrestle with her, especially, with Gandma always winning. She is portrayed as a very cool grandmother.
Magdlena doesn't know about the existence of magic and wizards, so the family had to reduce the use of magic when she visited for Alex's birthday. However Alex disobeys her parents and uses magic to switch bodies with her mother so she could have the quincenera she always dreamed of, despite the fact that she was caught by Justin and Max