When Andrew talks to Max about his mom, he tells Max that his own mother died when he was in college. But in S13:E1 when DeLuca is in the ER after being beaten up, Maggie volunteers to call and tell his mother about his injuries saying, "I'll call her. She knows me."
Andrew talks to Max about when his mother died but in the episode after Alex beats him up, Maggie volunteers to call and tell his mother about his injuries.