David suspects something is up. Kylie and David take him to a doctor, who says that he may have ADHD. Kylie blames herself, but David says it is not her fault. When David and Kylie prepare Lily's birthday party, Max escapes from the house and rubs chocolate cake over Steve's Volkswagen. Max ruins Lily's party by hogging the bouncy castle, kicking Liam Connor Jr. (Charlie Wrenshall) and throwing toys out of the window, which results in Gail dropping Lily's birthday cake. Kylie is distraught, as they pay more attention to Max than Lily and she thinks that people think of her as a bad mother. In January 2015, Max meets his father Callum Logan (Sean Ward) and instantly bonds with him, but in August 2015, he witnesses Callum and his thugs attack Jason Grimshaw (Ryan Thomas), causing him to fear Callum and refuses to be near him. In September 2015, Max stands up to Callum when he argues with David and tells his father that he wishes he was dead. Hearing this, Callum tries to grab Max who runs onto the road and into the path of Nick's van. Max badly cuts his leg in the accident. In December 2015, David's half-sister Sarah Platt (Tina O'Brien) discovers she is pregnant after being struck by a van and finds out she is expecting a boy. In March 2016, Sarah later gives birth to her son, Harry Platt. In June 2016, Max is told by Kylie and David about Callum's death and he decides not to go to his funeral, but he and Kylie remember him in their own way. In July 2016, when his school is closed, Kylie looks after him along with twins Aadi (Zennon Ditchett) and Asha Alahan (Tanisha Gorey); Asha dares Max to go in the annex. Max gets scared when the door handle comes off. When Gemma Winter (Dolly-Rose Campbell) has trouble with Clayton Hibbs (Callum Harrison) outside the kebab shop and is knocked unconscious, Kylie is stabbed in the chest by Clayton when she tries to intervene and collapses in David's arms. Kylie dies from her injuries and Max and Lily are told by David that Kylie has died. In August 2016, Max decides to write a eulogy for Kylie's funeral. In October 2016, David, determined to get revenge on Kylie's killer, plans to kill himself and Clayton, leaving Lily and Max a suicide video message.