A father involved in a head-on car collision, which claimed the lives of his wife and daughter, has died in hospital four days later.

The driver of the other vehicle involved in the crash on the M9 on Friday was pronounced dead at the scene.

The Falkirk couple's other two children, boys aged ten and 14, suffered serious injuries in the crash.

It is understood the driver of the van, Mark Hansen, 42, from Singapore, was travelling in the wrong direction on the motorway between Polmont and Linlithgow when he hit the Ahmad family's silver Mercedes.

He had been travelling on the wrong road for several miles but it is not yet known how he entered the carriageway.

Saadia Ahmad, 37, was pronounced dead at the scene and her daughter Ayesha Ahmad, nine, died at Forth Valley Hospital, Larbert, in the early hours of Saturday morning.

Police confirmed Sajjad Ahmad, 37, who was driving the Mercedes, died at Forth Valley Hospital on Tuesday.

The two-vehicle crash took place in the southbound carriageway of the M9 between junctions three and four around 9pm on Friday.

The two surviving children are being treated at the Queen Elizabeth University Hospital in Glasgow and the Forth Valley Hospital. They are said to be in a serious but stable condition.

Neighbour Eric Henry said the Ahmads had been good friends to him.

He said: "Sajjad was a lovely man and his family were lovely too. For them to be taken so suddenly like that, it's just terrible."

"I remember a few years ago when we had the really bad snow he was out giving free coffee away to people who were pushing cars in the street.

Sergeant Scott Sneddon of the Road Policing Unit said: "Our sincere condolences go to the Ahmad family, who have asked that their privacy be respected at this tragic time.

"Our enquiries continue to establish the full circumstances surrounding this collision, and I'd like to thank the witnesses who have so far come forward.

"Anyone who witnessed the collision, saw either of the vehicles shortly beforehand, or has any information about this and has not yet been in contact is urged to get in touch."

Anyone with information can contact Police Scotland on 101 or make an anonymous report through the charity Crimestoppers on 0800 555 111.

Download: The STV News app is Scotland's favourite and is available for iPhone from the App store and for Android from Google Play. Download it today and continue to enjoy STV News wherever you are.