studio. Within a month Van Gogh and Mauve fell out, possibly over the viability of drawing from plaster casts. Van Gogh could afford to hire only people from the street as models, a practice of which Mauve seems to have disapproved. In June Van Gogh suffered a bout of gonorrhoea and spent three weeks in hospital. Soon after, he first painted in oils, bought with money borrowed from Theo. He liked the medium, and he spread the paint liberally, scraping from the canvas and working back with the brush. He wrote that he was surprised at how good the results were. By March 1882, Mauve appeared to have gone cold towards Van Gogh, and he stopped replying to his letters. He had learned of Van Gogh's new domestic arrangement with an alcoholic prostitute, Clasina Maria "Sien" Hoornik (1850–1904), and her young daughter. Van Gogh had met Sien towards the end of January 1882, when she had a five-year-old daughter and was pregnant. She had previously borne two children who died, but Van Gogh was unaware of this. On 2 July, she gave birth to a baby boy, Willem. When Van Gogh's father discovered the details of their relationship, he put pressure on his son to abandon Sien and her two children. Vincent at first defied him, and considered moving the family out of the city, but in late 1883, he left Sien and the children. Poverty may have pushed Sien back into prostitution; the home became less happy and Van Gogh may have felt family life was irreconcilable with his artistic development. Sien gave her daughter to her mother and baby Willem to her brother. Willem remembered visiting Rotterdam when he was about 12, when an uncle tried to persuade Sien to marry to legitimise the child. He believed Van Gogh was his father, but the timing of his birth makes this unlikely. Sien drowned herself in the River Scheldt in 1904. In September 1883, Van Gogh moved to Drenthe in the northern Netherlands. In December driven by loneliness, he went to live with his parents, then in Nuenen, North Brabant. Emerging artist Nuenen and Antwerp (1883–1886) In Nuenen, Van Gogh focused on painting and drawing. Working outside and very quickly, he completed sketches and paintings of weavers and their cottages. Van Gogh also completed The Parsonage Garden at Nuenen, which was stolen from the Singer Laren in March 2020.