Kylie from Sheffield shared her story for a documentary on Channel 5 and claimed she caught the pair watching porn together
Finding out your partner has been cheating is painful enough, but when the other woman is your mother, the deceit is almost too much to comprehend.
But that's exactly what Kylie, 26, from Sheffield claims happened to her.
The mum-of-two shared her story for Channel 5 documentary Wedding Disaster Specials, where she told how she found out her mum and partner were having an affair after catching them watching porn together.
Kylie met partner Gary on social media before they finally met face-to-face at her 21st birthday party.
"He made me smile, he made me laugh, I felt like I was walking on a cloud constantly," she told The Daily Star.
"From there we ended up in a relationship."
The couple moved in together five months later. Their relationship moved fast and on Kylie's 24th birthday Gary surprised her by popping the question.
"I had never been so happy to share that moment with people I held close. It was a very good night. And then, two or three weeks later, we found out we were pregnant."
Kylie claims her partner's behaviour began to change and he became argumentative so she turned to her pillar of support - her mum Shirley.
And as Kylie gave birth her mother began staying over on a regular basis to help out.
"I used to look forward to her coming around because she was my only female friend and I could talk to her about anything from shopping to twinges in my pregnancy and relationship problems."
A few weeks later Kylie said she became suspicious after discovering her mum and fiance watching porn together.
Kylie said: "I'd gone to bed early, my daughter woke up about 12 for a bottle so I gave her one and I heard a DVD on the TV, which I thought sounded like it was a porn DVD.
"When I came through the door, I saw it was a porn DVD and that my partner and my mum were sat on the settee watching it.
"When I confronted them, they said it was something that had just started and they had put the wrong DVD in.
"They said that I was insecure and paranoid because I've just had a baby and that I was imagining things.
"The next morning it was as though nothing had happened."
Kylie put the worries to the back of her mind, and soon after discovered she was pregnant again.
After their second child was born Kylie and Gary started to argue more and Kylie kicked him out, but her mum persuaded her it was worth another try.
She said: 'My mum was such a strong believer in him that I thought if she can believe in him, surely I should.
"I took him back and he moved back in. Things were fantastic."
Things didn't last and one day Kylie noticed her mother's phone lying around and decided to take a look.
She said: "There was one message from him to her saying, 'I'll do you tonight,' and there were no other text messages.
"At that point I decided I wouldn't go to the gym, I'd come back instead and catch them out.
"When I got home, it took me at least 15 minutes to get back into the house because his keys were in the door.
"When I eventually managed to get into the house, my mum was in the shower and he was in his boxer shorts."
Kylie said after initially denying anything had happened, her mum finally confessed three months ago.
The next day a letter dropped through her door from her solicitor which contained a confession that her partner had been sleeping with her mother for four years.
Kylie said: "I couldn't believe that my mum did the ultimate betrayal. 'My mum was my best friend, hopefully she might get back there. But once you break that trust, it's hard to get it back."
When Channel 5 contacted Kylie's mother she said she had an on-off relationship with her daughter's ex for two-and-a-half years but denied watching porn.
Kylie's ex said he did not want to take part in the programme.
* Wedding Disaster Specials continues tonight on Channel 5 at 10pm
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