Question: Who did Van Gogh fall in love with in 1881?
About the article "Sien (Van Gogh series)", section "Estrangement from family".

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 In 1971, singer Don McLean wrote the ballad "Vincent" in honor of Van Gogh; also known by its opening words, "Starry Starry Night," the song refers to the painting  McLean's song was also sung by Josh Groban in 2002, and the punk band NOFX did a version which can be found on a rarities and b-sides double album.
In 2006, Hong Kong singer-songwriter Ivana Wong composed a song called "Painting's Meaning" (Traditional Chinese: "畫意") in memory of van Gogh.
In 2007, Folk rock songwriter Freddy Blohm had a different take on Van Gogh in the song "Cheerful."
Bob Dylan in the 1960s wrote an unreleased, but widely bootlegged, song called "Vincent Van Gogh."
Bob Neuwirth, a folksinger friend of Bob Dylan's, wrote a song in the 1960s called "Where did Vincent van Gogh?"
Bandits of the Acoustic Revolution (and later frontman Tomas Kalnoky's other band Streetlight Manifesto) mention van Gogh in their song "Heres to Life": "Vincent Van Gogh why do you weep?/ You were on your way to heaven but the road was steep./ Who was there to break your fall,/ we're guilty one and all."
The title track for Joni Mitchell's album Turbulent Indigo references Van Gogh's madness.
The album cover is a take on Van Gogh's "Self-Portrait with bandaged ear".
A Spanish Group is named La Oreja de Van Gogh ("Van Gogh's Ear").
There was a parody of Van Gogh and his ear in the Family Guy Episode "Fast Times at Buddy Cianci Jr High" The Vigilantes of Love released a song titled "Skin" which is about Van Gogh.
Smooth jazz composer/singer Michael Franks released the song "Vincent's Ear" in 1990 on his "Blue Pacific" album produced on the Reprise label.
Lyrics include "No-one understands all the love inside he tried to give/No-one understands his life was hard to live."
Mauve was married to van Gogh's cousin Ariëtte (Jet) Sophia Jeannette Carbentus, and he was a major influence on van Gogh, who revered him.
He is mentioned, directly or indirectly, in 152 of van Gogh's surviving letters.
A comparative table of number of letters mentioning his most significant influences is shown in the table.
Van Gogh spent three weeks at Mauve's studio at the end of 1881 and during that time he made his first experiments in painting under Mauve's tutelage, first in oils and then early the next year in watercolour (previously he had concentrated on drawing).
Mauve continued to encourage him and lent him money to rent and furnish a studio, but later grew cold towards him and did not return a number of letters.
In a letter to his brother Theo van Gogh dated 7 May 1882, van Gogh describes "a very regrettable conversation" in which Mauve told him their association was "over and done with" adding by way of explanation that van Gogh had a vicious character.
Van Gogh continued his letter by expressing his sorrow, and then launches defiantly into a passionate defence of his relationship with Clasina (Sien) Maria Hoornik, a pregnant prostitute he had befriended.
The reality was that they were lovers.
The presumption must be that Mauve had heard of the relationship (although van Gogh's letter does not say so expressly) and broke off the association because of it.
However, their relationship had already become strained by late January.
Nevertheless, van Gogh continued to hold Mauve in very high esteem and dedicated one of his most iconic paintings to Mauve's memory after hearing of his sudden death.
Mauve's mother Elisabeth Margaretha Hirschig was a first cousin twice removed of Anton Hirschig, the young Dutch artist who was a fellow lodger with van Gogh at the Auberge Ravoux at the time of van Gogh's death. 
Vincent van Gogh drew and painted a series of works of his mistress Sien during their time together in the Netherlands.
In particular, his drawing "Sorrow" is widely acknowledged as a masterwork of draftsmanship, the culmination of a long and sometimes uncertain apprenticeship in learning his craft.
Commonly called Sien Hoornik, Clasina Maria Hoornik (1850 - 1904) lived with van Gogh during much of his time in The Hague from 1881 to 1883.
Van Gogh used Sien, a pregnant prostitute, as a model for his work and later took Sien and her daughter into his home.
Van Gogh made drawings and paintings of Sien and her daughter, baby and mother over that period, which reflected the domestic life and hardships of the working poor.
Their relationship was not accepted by his family or supporters, although his brother Theo did not withdraw his support over it.
It did contribute undoubtedly, however, to a split with Anton Mauve, a cousin-in-law and noted painter of the Hague School, who had introduced van Gogh to painting as well as supporting him financially, and whom van Gogh revered.
At his brother Theo's urging, van Gogh left Sien in 1883 to paint in Drenthe, putting an end to the only domestic relationship he was ever to have.
Sien resumed her life as a seamstress, cleaning woman and likely prostitute before marrying in 1901.
On 12 November 1904, aged 54, she threw herself into the Schelde river and drowned, fulfilling a prophecy she had made to van Gogh in 1883: "Yes, I'm a whore ... it’s bound to end up with me jumping into the water."
In 1880 when he was 27 years-old, Van Gogh decided to become an artist.
In October of that year he moved to Brussels and began a beginner's course of study.
Van Gogh returned to Etten in April 1881 to live with his parents and studied art on his own.
His younger brother Theo, an art dealer at the main branch of Goupil & Cie, encouraged him and started covering Van Gogh's expenses.
Van Gogh used images from illustrated magazines to teach himself how to draw.
Charles Bargue, a French artist, wrote two books on drawing that were a significant source of study for Van Gogh.
Both written in 1871, one is "Cours de dessin" and the other "Exercises au fusain pour préparer à l’étude de l’académie d’après nature," Van Gogh created copies of the drawings or adapted nude images for clothed depictions.
In January 1882, he settled in The Hague where he called on his cousin-in-law, the painter Anton Mauve (1838–88).
Mauve introduced him to painting in both oil and watercolor and lent him money to set up a studio.
Van Gogh began drawing people from the working poor, including the prostitute Clasina Maria "Sien" Hoornik (1850–1904, with whom he would become involved.
Van Gogh dreamed his studio would one day become a form of respite for the poor where they could receive food, shelter and money for posing.
His work was not well received; Mauve and H.G.
Tersteeg, manager of Goupil & Cie, considered the drawings coarse and lacking charm.
Van Gogh likened the subjects "unrefined" characteristics of his drawings to harsh "yellow soap" made of lye.
Van Gogh's relationship with Sien changed as they lived together with Maria, her five-year-old daughter, to the great disappointment of his family.
Mauve appears to have suddenly gone cold towards Van Gogh and did not return a number of his letters, Van Gogh supposed that Mauve did not approve of his domestic arrangement with Sien and her young daughter.
Van Gogh created a number of drawings of Sien and her daughter.
Having ended his relationship with Sien, Van Gogh moved to Drenthe in September 1883 and painted landscapes.
Three months later, he moved back in with his parents, who were at that point living in Nuenen.
In 1884, Van Gogh created the weaver series, works of rural life and landscapes.
For a brief period of time, he gave painting lessons in Eindhoven.
Near the end of the year, Van Gogh began experimenting with complementary colors, influenced by the color theories of Charles Blanc.
Vincent made many studies of peasants in 1885, culminating in his first major painting, "The Potato Eaters."
In his works, Van Gogh used particularly somber colors and colors mixed with black, which he felt was like that of 17th-century masters, such as Frans Hals.
His brother, Theo van Gogh (art dealer) had asked him often to lighten up his work, referring to the work of the Impressionists.
Once Van Gogh went to Paris, he did open up his palette to color and light and admitted that his works from this period were old-fashioned.
Theodorus van Gogh, Vincent's father, died March 26, 1885.
In November, Vincent moved to Antwerp. 
"Boy Cutting Grass with a Sickle" is a watercolor painting created in 1881 by Vincent van Gogh.
It is owned by the Kröller-Müller Museum.