I got more information from my Grandfather. This is what he has told me so far, I will add more as soon as he sends me more info.
My Grandfathers great grandfather, Francois Paulus Naude Slabbert was part of the Voortrekkers in the fight at Bloedrivier. He had a child, Daniel Slabbert who lived in Fouries Burg on a farm. There was a railway that went through his farm and they build a station on his farm that today still is known as Slabbert Stasie. Daniel Slabbert was also a "hero" when he took all the farmers cattle and horses and hit them from the English army who wanted to kill all livestock.
He had a chield called Johannes Slabbert, my Grandfathers dad who also lived in Fouriesburg.
I will try and get all the dates as soon.
Regards
Zander