You got any pics of your dad's split ?
Have you done any investigating yet?As mentioned above could be the clutch or maybe a cv joint that has let go.
same happened to me you sure ur drive shaft hasnt snapped have a look mate.
One shaft flapping about. Although when I did it on my mini it actually broke inside the CV joint so it wasn't visible.Jack the front of the car up and put it in first at idle. If the wheels turn your gearbox is fine.nick