A BRITISH grandad accused of trying to drown his own daughter-in-law has been secretly dating her for years, it has been claimed.

Mark Gibbon, 62, is charged with attempted murder after allegedly forcing Jasmine Wyld’s head underwater at a Florida resort pool as the pair argued over his will.

Gibbon and Wyld, 33, are both believed to have denied being in a romantic relationship when quizzed by police, The Sun can reveal.

They were reportedly asked due to investigators seeing if it involved potential domestic violence.

But a family source revealed to the MailOnline the pair grew close to one another after they both split from their partners.

They soon got into into a relationship and have now been together for the past two years, according to the source.

They said: “Mark and Jasmine have been seeing each other for a few years, but they’ve never admitted it.

“[The couple] do an awful lot together and they go away on holiday with the children a couple of times every year.

“They went to Florida two years ago and have been to Budapest where she posted pictures of them together like a couple.”

Wyld – a hairdresser – separated from Gibbon’s son Alex, 34, back in 2021 but the pair still share two young children together.

Gibbon divorced his wife and lives alone at a £800,000 semi-detached home in Beaconsfield he purchased in 2023.

The secret couple are alleged to spend a lot of time inside the large Buckinghamshire home together.

Alex has had several major issues with his dad in the past including being jailed in 2024 for driving into Gibbon with an £80,000 Porsche Cayenne.

The pair also became embroiled in a public row in 2023 after Alex left his dad’s business for an unknown reason.

The family source confirmed that Alex and Gibbon no longer speak.

They added: “He feels an awful betrayal at how his dad has struck up a relationship with the mother of his two children.”

Gibbon is now behind bars over a separate family falling out with Wyld.

The couple were on holiday at the Solterra Resort in Devenport, near Disney World, Florida with the two children.

Gibbon and Wyld soon began arguing over the “stipulations of his will” around a pool, according to US police.

The granddad then pushed Jasmine’s head “under the water and held her down multiple times”, according to the arrest affidavit.

She told cops after the ordeal she “could not breathe and believed that she was going to drown,” according to Polk’s County Sheriff’s Office.

According to deputies, Jasmine was forced to “fight Mark in order to get away from him and from under the water but he kept pushing her back under”.

Her nine-year-old daughter then tried to help despite having no idea what was going on as she leapt into the water to her mother’s defence

She tried desperately to intervene, but Gibbon allegedly kept pushing her away.

Jasmine spotted some two women in the distance and screamed at them to call 911.

Gibbon is said to have stopped only when the sisters said they were calling the sheriff’s office.

He now faces one count of attempted murder and two counts of battery.

The family source admitted the pair had been through troubling times of late.

They said: “But I have been told that Jasmine was unhappy that they have been in a relationship for a few years and she is not named in his will.”

When questioned, Gibbon allegedly admitted to pushing Jasmine underwater, but insisted he hadn’t been trying to drown her.

He claimed they had been drinking, began arguing and that she slapped him – which triggered the fight, reports Law & Crime.

Gibbon is a lighting technician, who runs his own firm called MRG Lighting.

He has worked on music videos for Ed Sheeran, Sam Smith and Paloma Faith, according to his website, as well as on film and TV sets.

He is also listed as the only director of Sage Hairdressing.

The Sun has reached out to Gibbon for comment.