They didn't. They just came across it.
Fred and George Weasley "nicked" the map from Filch's office in their first year at Hogwarts. They had been taken to his Office for letting off a Dungbomb and saw a drawer marked Confiscated and Highly Dangerous. George dropped another Dungbomb, while Fred stole the Map from the drawer.
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Don't know yet. But to correct what was written here before. Roxanne Weasley is the daughter of George Weasley and Angelina Johnson. Her older brother is Fred Weasley II.
I don't know where you can get Fred and George sweaters but you can find House sweaters online. or you could get Blue sweaters and add a 'F' and 'G'
Although they were identical, Fred and George's Patronums were different. Fred's was a hyena, and George's was a coyote. When Fred died, George's Patronus might've changed to a Hyena, but he was never able to cast one again - how could he when every happy memory he had involved a dead man?------------------------------------------------------------------------------------------------The previous answer is actually incorrect. J.K. Rowling has never actually revealed what the patronuses are of the Weasley Twins. Many people have their own opinions of what they think their patronuses are (hyena, coyote, foxes, ect.) but we are never really sure...
George Weasley's height is never mentioned. The actor who played him, Oliver Phelps, is 6'3. However, in Harry Potter and the Philosopher's Stone, he is described as "short and stocky," so that at the age of 13, his 11-year-old brother Ronald Weasley is about as tall as him.
Not that we know of.