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Mr. Loughner’s father moved into the house as a bachelor and eventually got married, longtime next-door neighbor George Gayan said. Property records show Randy Loughner has lived there since 1977. Unlike other homes on the block, the Loughners’ is obscured by plants. It was assessed in 2010 at $137,842.

Randy Loughner apparently has not worked for years — at least outside his home.

Mrs. Loughner got a job with the county parks and recreation department just before Jared was born, and since at least 2002 she has been the supervisor for Roy P. Drachman Agua Caliente Park on the outskirts of the city. She earns $25.70 an hour, according to Gwyn Hatcher, Pima County’s human resources director.

Linda McKinley, 62, has lived down the street from the Loughner family for decades and said the parents could not be nicer — but that she had misgivings about Jared as he got older.

“As a parent, my heart aches for them,” she said.

Associated Press writers Alicia Chang and Gillian Flaccus in Tucson, Jacques Billeaud and Bob Christie in Phoenix, Christy Lemire in Los Angeles and news researcher Julie Reed in Charlotte, N.C., contributed to this report.