Sonya's darkest secrets, which the people in Sonya's life know nothing about. The actress thought that Jade's appearance would "completely rock the boat", especially as she has the potential to cause trouble for her sister and expose her for lying to everyone. During an interview with a Channel 5 journalist, Morey revealed that the last time the siblings saw each other, they were at their grandmother Hilda's (Maureen Edwards) home and Sonya was in "a very bad place". This causes Sonya to think that Jade might be in town to get some form of revenge. The sister's relationship is initially "rocky" and Sonya tries to get rid of Jade, before she can meet Toadie and his son, Callum. However, she runs out of time and Jade quickly realises that Callum is actually the child Sonya gave up to be raised by their grandmother. Jade demands an explanation and then urges her sister to tell the truth. However, after Jade sees how happy Sonya is, she becomes "fiercely supportive" of her. Pranita noted "It's almost the Mitchell sisters against Ramsay Street." Morey told Jason Herbison that she could not have asked for a better pretend sister in Pranita, adding that they had become good friends off-screen. Jade's reappearance in Sonya's life precipitated the revelation that Sonya is Callum's biological mother. Morey admitted that she was "shocked" and "stunned" when the producers told her about the development for her character. She questioned how the storyline would come together, since there had never been any indication that Sonya was Callum's mother before. Morey explained "Initially, I thought, 'How could this work – Sonya being Callum's mum?', but then I realised it does work. All of a sudden, it creates even more depth and complexity to Sonya and the decisions she's made and her motivations for things like forgiving Toadie for his and Steph's sham marriage. There's this whole other layer." Morey called the storyline "phenomenal" and noted that it would change everything that viewers thought they knew about why Sonya became part of Toadie and Callum's lives. Morey researched how other people had reacted to similar situations and came to realise that the pieces fall into place, despite it being "a leap." She stated that Sonya had entered Callum's life, not to get him back, but to see if he was okay. However, she then fell in love with Toadie. The actress believed