Netflix has just released Con Mum, a gripping documentary that explores the unsettling case of Graham Hornigold and his mother, Dionne. This addition follows the dramatic rise of the true crime genre, which has seen various titles about con artists since the popular demand spurred by Tinder Swindler.
Over the past year, viewers have also witnessed titles like Dirty Pop: The Boy Band Scam, Apple Cider Vinegar, and Sweet Bobby. Now, the spotlight is on Graham Hornigold, a British pastry chef who, in 2020, believed he was experiencing a heartfelt reunion with his estranged mother, who he only later discovered was a notorious scam artist.
With the documentary now available for streaming, let’s dive into the current status of Dionne Hornigold, previously known as Theresa Mahamud. Prepare for potential spoilers as we unfold this complex narrative.
The Current Whereabouts of Dionne Hornigold

Following the revelation of her true nature as a scam artist, Dionne returned to Asia. At the conclusion of Con Mum, viewers learn that she is currently in Malaysia—her birthplace—yet her recent whereabouts remain largely unknown.
Text displayed in the documentary indicates: “Dionne did not respond to requests for comment. She has never faced criminal charges for the allegations made in this documentary.” Currently, she is believed to be around 85 years old.
Dionne’s alleged fraud extends to multiple individuals who have claimed to be victims of her deceptive schemes, including what is essentially a Ponzi scheme, wherein funds acquired from new investors are used to pay returns to earlier ones.
When Dionne reconnected with Graham in 2020, she introduced herself as a billionaire businesswoman and claimed to be the secret daughter of the former Sultan of Brunei. Initially elated by their reunion, Graham was later heartbroken to learn that she supposedly had cancer and only months to live.
During their initial meetings, she lavishly gifted Graham and his ex-wife, Heather Kaniuk, expensive cars, booked luxurious hotel stays, and even whisked them away to Switzerland to secure a trust fund. However, it soon became clear that the funds she was using had likely been defrauded from her victims.
As time went on, Dionne began requesting Graham to pay off significant debts that she had incurred, ultimately leading him to grapple with debt amounting to £300, 000. Several other victims shared their stories in Con Mum, illustrating the widespread impact of Dionne’s deceit.
Despite not facing criminal charges, Dionne has a history of arrests. Upon investigation, Graham and Heather discovered her troubled past, which includes a 1982 arrest where she pleaded guilty to multiple counts of theft.
Reports also noted prior convictions for shoplifting and fraud. Furthermore, she has been married multiple times, with discrepancies in her identity apparent across different marriage certificates.
In Graham’s own words, “I wanted to know who my mom was. This is who she is, and who she has been all of her life. I’ve been side-swiped by a seasoned pro. Just happens to be my mother.” The deception deepened as Graham uncovered that she had fabricated her cancer diagnosis, using red food dye to simulate blood in her urine.
Is Dionne Graham’s Biological Mother?

As the documentary unfolds, a significant twist reveals that Graham’s DNA test displays a 99.9% probability that Dionne is indeed his biological mother. Given her history of deception, initial skepticism about her maternity was understandable. Adding to the confusion, she had refused a DNA test during their first encounter.
Graham’s early life was filled with uncertainty; having been born in Germany, fostered for a time, and then raised by a stepmother and an abusive father in the UK, he had always longed for a connection with his mother. In the documentary, he reflects, “I didn’t know my mom. My father never really spoke about her.” Meanwhile, Heather conveyed Graham’s deep desire for love and acceptance.
This search for family took a turn when, during the pandemic, Dionne unexpectedly reached out, prompting a reunion that would change Graham’s life forever. Following the connection, he sought to confirm their relationship through a DNA test, which Dionne consented to at last.
Graham’s reaction to the DNA results was one of disbelief: “This is the hardest thing to understand, ” he confesses. Sharing a bittersweet moment during their final video call, Dionne expressed her love for him, saying, “I’m really sorry for what happened.” Graham’s response was poignant: “Yeah, it was kind of life-changing, mom.”
Dionne went on to apologize but acknowledged, “I cannot change, son. I cannot change.” Reflecting on the circumstances surrounding their reunion, Graham speculated that the pandemic inadvertently pushed Dionne to reach out due to a lack of conventional means to sustain herself in a dramatically changed world.
The Financial Legacy: Is Graham Still in Debt?

Throughout the documentary, the financial repercussions of Dionne’s actions are laid bare. Graham finds himself burdened with approximately £300, 000 in debt, but he remains resilient as he maintains his career as a chef and provides for his home.
In a candid interview with The Guardian, Graham emphasized his commitment to ensuring that his son is unaffected by the challenges he faces.“I won’t let it affect him, in the sense that he won’t see his dad. I’m going to be a big part of his life, ” he asserted.
Graham’s engagement with his mother occurred while he was happily in a relationship with Heather, who later gave birth to their son. Shortly after, Dionne’s involvement began to grow deeper, pulling Graham away to Switzerland under the pretense of her illness.
After several months of manipulation during a crisis, Graham managed to return home for the holidays while Heather ventured to New Zealand with their child, following Dionne’s insistence that he should not join them.
Despite being apart, he maintains a digital connection with his son. According to The Guardian, Graham is eager to reunite in person once his finances allow.
For those intrigued by this remarkable tale of deception and familial bond, Con Mum is currently available for streaming on Netflix.
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