Question: The brother of Van Gogh was named what?
About the article "Portrait of Dr. Gachet", section "Background".

Candidate passages:
Theodorus "Theo" van Gogh was born on 1 May 1857 in the village Groot-Zundert in the province of North Brabant, Netherlands.
He was the son of Theodorus van Gogh and Anna Cornelia Carbentus.
His elder brother was Vincent van Gogh (1853–1890), who later became a famous painter. 
In 1886, Van Gogh left Holland never to return.
He moved to Paris to live with his brother Theo, a Parisian art dealer.
Van Gogh entered Paris as a shy, somber man.
While his personality would never change, he emerged artistically into what one critic described as a "singing bird".
Although Van Gogh had been influenced by his cousin Anton Mauve and the Hague School, as well as the great masters in Holland, coming to Paris meant that he was exposed to Impressionism, Symbolists, Pointillists, and Japanese art ("see Japonism").
His circle of friends included Camille Pissarro, Henri Toulouse-Lautrec, Paul Gauguin, Émile Bernard, Paul Signac, and others.
The works of the Japanese printmakers Hiroshige and Hokusai greatly influenced Van Gogh, both for the subject matter and the style of flat patterns of colors without shadow.
In the two years from 1886 through 1888 he spent working in Paris, Van Gogh explored the various genres, creating his own unique style. 
Two other paintings.
The Langlois Bridge at Arles with Road alongside the Canal.
Van Gogh used varying techniques when he created the painting, depending upon the subject and what he wanted to convey.
The grass and the path in the foreground were painted rapidly.
The bridge, though, was painted in greater detail, with clearly defined stone piers and wooden beams.
The detail in the ropes used to lift the roadway show that they are attached to the wooden lifting gear.
Van Gogh also plays close attention to the reflection of the bridge in the water.
In the distance is another drawbridge.
Van Gogh claimed the painting as "something funny...
I will not create every day."
There was something about the setting for this painting that reminded him of his homeland.
He asked his brother Theo to frame an earlier version of the painting in blue and gold (blue in the front, gold on the side) and offer it to an art-dealer in the Netherlands, named Tersteeg.
Tersteeg knew Van Gogh and his brother Theo when they lived in The Hague.
He nurtured Van Gogh's early artistic interests but their relationship suffered after Van Gogh lived with a prostitute named Sien.
The Van Gogh Museum claims that the painting is the last in a series of three, yet Silverman has identified four oil paintings and a fifth watercolor, as outlined in this article. 
Van Gogh wrote to his brother Theo in November 1882 that he had drawn a portrait of Jozef Blok (F993), a street bookseller who was sometimes called "Binnenhof's outdoor librarian".
Unlike the character studies, the work was detailed in pencil with watercolor and chalk.
At this time it was rare for Van Gogh to use color, as he found it difficult to work with (see early works of Vincent van Gogh). 
In Paris Van Gogh learned to paint more than what one sees, but what is should be.
Van Gogh felt "Pink Orchard" was an example of wise use of that technique, such as leaving a field blank behind the orchard to create the feeling of distance.
The way in which he outlined the bark of the tree indicates influence of the Japanese prints that he greatly admired.
Using an Impressionist technique of placing colors side by side, Van Gogh makes short dots or brush strokes of colors to represent grass.
On the top of the tree he uses rougher, more impasto brushstrokes to represent the colorful blossoms.
Van Gogh asked his brother Theo to "shave off" some of the impasto in this painting.
Apparently he did not reline, a process of heavy pressure and heat to flatten the surface, because the paintings sharp edges of thick impasto remain.