Given the task definition and input, reply with output. You need to read the given passage and construct a question about the information present in the passage. The question should be answerable from the passage. Most importantly, only those questions are allowed whose answers cannot be determined from a single sentence. Do not generate questions that require only a single sentence to answer. Instead, try to combine two sentences and create a question from that combination. Do not create open-ended questions, i.e., the answers to them cannot be found precisely from the information provided in the passage.

Paragraph- Sent 1: Wanderjahre and marriage (1490-94) After completing his term of apprenticeship, Durer followed the common German custom of taking Wanderjahre--in effect gap years --in which the apprentice learned skills from artists in other areas; Durer was to spend about four years away.
Sent 2: He left in 1490, possibly to work under Martin Schongauer, the leading engraver of Northern Europe, but who died shortly before Durer's arrival at Colmar in 1492.
Sent 3: It is unclear where Durer travelled in the intervening period, though it is likely that he went to Frankfurt and the Netherlands.
Sent 4: In Colmar, Durer was welcomed by Schongauer's brothers, the goldsmiths Caspar and Paul and the painter Ludwig.
Sent 5: In 1493 Durer went to Strasbourg, where he would have experienced the sculpture of Nikolaus Gerhaert.
Sent 6: Durer's first painted self-portrait (now in the Louvre) was painted at this time, probably to be sent back to his fiancee in Nuremberg.
Sent 7: In early 1492 Durer travelled to Basel to stay with another brother of Martin Schongauer, the goldsmith Georg.
Sent 8: Very soon after his return to Nuremberg, on 7 July 1494, at the age of 23, Durer was married to Agnes Frey following an arrangement made during his absence.
Sent 9: Agnes was the daughter of a prominent brass worker (and amateur harpist) in the city.
Sent 10: However, no children resulted from the marriage.

What did all of Martin Shongauer's brothers do?