Lugo said his sister got a bad vibe from the house and asked him not to let the children play unsupervised nearby.

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Another neighbor, Israel Lugo, said his sister got a bad vibe from the house and asked him not to let the children play unsupervised nearby.

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Colleen, then 15, continued her life at school, thinking her sister would eventually be OK. "I didn't realize how bad it really was, " she recalls.

CNN: December 24, 2012 -- Updated 0455 GMT (1255 HKT)