Over the past few weeks, viewers have watched the sinister character plan his escape to Indonesia using Tyler's boat.
After making the mechanic lose his job when he tampered with equipment which injured Amy Williams as a result, Hamish started to work on turning his son against his family and friends.
Despite fans seeing Hamish's true motives, Tyler still has no idea.
Amid the speculation that Hamish could ruin Tyler's relationship with girlfriend Piper Willis, Mavournee exclusively revealed to OK! Online about whether Hamish will succeed.
"It seems to be Hamish's plan at the moment. He just wants to get Tyler isolated from everyone so he can have completely control over him."
Teasing upcoming scenes, the actress added: "Whether or not he's successful in getting in between Piper and Tyler, I don't know if I can say but he definitely has a good go at it."
But as the storyline continues, viewers of the Australian based soap will also see Piper going against her gut feeling about Tyler's biological father.
"As you can see, he's a manipulator and even when Piper becomes slightly suspicious of Hamish, she's just so happy to see Tyler happy and to have a dad that he can trust and rely on, she turns a blind eye.
"She gives him the benefit of the doubt to just see him happy."
However, Hamish won't be able to hide for long and Mavournee revealed how the characters will react when they find out the truth.
"It comes as a surprise when it all comes to a head and he is eventually exposed. She is as surprised as Tyler and the audience will be as well.
"She is usually a good judge of character but she's turning a blind eye to a lot because she almost doesn't want to believe it as well.
"Hamish seems too good to be true and unfortunately he is."
Neighbours continues on Channel 5, weekdays at 1.45pm and 5.30pm.
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