The Steyn family lived near Winburg on the farm Josephinesdal. Steyn was born on 2 October 1857 on the farm Rietfontein near
Winburg in the
Orange Free State. His father Marthinus (known as Marthinus 'blinkstewels') was away from home, following the death of his own father, to assist his mother on a three-month-long round trip from Winburg to
Swellendam in the
Cape Colony. As Steyn's mother, Cecilia, was pregnant with Marthinus Theunis, they thought it safer for her to stay with her sister Gertruida, who was married to Theunis Wessels, a farmer at Rietfontein. Steyn was intended to be named only Marthinus after his father, but because of the care that Theunis and Gertruida took during Cecilia's pregnancy, Steyn was named both after his father Marthinus and his uncle Theunis. In later years his family always called him Theunis. During the
Free State–Basotho War of 1858, the Steyns were driven from their farm and lost almost everything. After the death of Steyn's two grandfathers, his Wessels grandmother convinced his father to buy his own farm. They bought the farm Suurfontein/Zuurfontein, on the Modder River, about 13 miles from
Bloemfontein. It is on this farm that Steyn spent most of his youth, and experienced the open and free spaces of the Free State. Steyn started his school years in a small farm school, on the farm Rooiwal. The school was forty minutes away by horse and the teacher was Mr. Wiggins, who taught in English. Another Basotho War started in 1864, disrupting the family, and causing Theunis and his brother Tewie to stay with their grandmother in Wessels, where they attended a small grammar school briefly; afterward they were sent to
Grey College. At the age of 16, he left school with his brother Tewie to farm on Zuurfontein. Steyn's family lived right across from the then president of the Free State,
J.H. Brand, in Bloemfontein. The family socialized with other groups of Dutch families. The Steyn home in Bloemfontein, Green Lodge, was the meeting place for the young people of Bloemfontein. The house was open for everybody: from the Fichardts of German origin, to the English speaking Robertses, to the Jewish Baumans, to English speaking Afrikaners, like President Brand, as well as the Dutch community. == Studies ==