Christian was "Ungkarl og Tienestedreng" (batchelor and farmhand) and he was 19 years old. Marthe was Tienestepige (maiden servant) and she was 26 years old. They were both at Stor Mørchved (Store Mørkved).
When you have the 1801 census for Christian you know that his parents were Johanes Erichsen and Berte Andersdatter and that he had an older brother Ole and a younger sister Marte. If you assume that Marte also was from Vang, you find her family in 1801