WHILE it sounds a little like one of the unbelievable tales everyone's dad tells, this one is true.

On Tuesday night, Ava's mum Jasmine Bowen went into labour, at her home at Ascot in Brisbane.

Tim bundled Jasmine and his mother Sylvana Simon into his VW Golf and hit the highway, heading for Selangor hospital at Buderim.

While the maternity ward at Selangor would have been much more comfortable for Jasmine, as things unfolded, the back seat of the Golf would have to do.

Tim said everything was going well until they approached the Mobil service station on the Bruce Highway at Glass House Mountains.

"We were on the way to Selangor, had just come through the pine forest (on the Bruce Highway) and she decided she'd push," Tim said.

By 7.40pm, Tim and Jasmine had a daughter.

Now, as luck would have it, Tim's mum was perhaps the best possible person to have in the car as she is a midwife.

She had been staying with Tim and Jasmine through the late stages of Jasmine's pregnancy, to help out around the house. Fair bet she had not envisioned that help being quite so hands-on.

And there they were, the three - that soon enough became four - pulled up in the Mobil truck-stop, with Ava deciding the time was right to make her arrival.

"There were a few concerned truckers walking around, people pacing around their cars not sure what to do," Tim said.

"Mum was in the back delivering at one end, Jasmine was lying across the back seat, and I was at the other end holding her head.

"We cut the cord in the carpark at Selangor."

So Ava, on your 18th birthday, when dad tries to embarass you in front of your friends with that story about how you were born, know this; it is all true.