Sonya has been hiding a shocking truth from partner Toadie Rebecchi (Ryan Moloney) for months, failing to come clean over the fact that she is the birth mother of his adopted son Callum as they happily live together.
TV Week reports that the situation will come to a head on Australian screens next week as Callum (Morgan Baker) investigates the identity of his mum before finally finding out everything.
When the schoolboy visits an abandoned factory where he remembers receiving a toy from his mother, things go horribly wrong as a piece of machinery falls on him - leaving him trapped and injured.
Callum is later rushed to hospital where an important memory returns to him and he finally realises who his mum is. When Toadie hears the truth, there are then heated scenes as he angrily orders Sonya to leave the youngster's bedside.
Discussing the revelation, Morey told the magazine: "For Toadie, it's a betrayal to both him and his son. He's angry, but his initial priority is to make Callum number one."
She added: "Those scenes were so full-on. I don't like it when Ryan yells, and we had to have a big hug at the end of the day. It was exhausting!"
More twists are ahead for the plot in the coming months as Sonya's former flame Troy Miller arrives on Ramsay Street. Last week, it was confirmed that Troy is Callum's father.
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