A neighbour has claimed Isidro Garcia "was always watching" his captor from a window whenever she left the house.
Maribel Garcia said it appeared that the woman - who was kidnapped by the 41-year-old 10 years ago - "knew she had to do what he said".
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The two brothers were aged 10 and 11 when they tortured two boys in Edlington, south Yorkshire, in 2009 in a case that shocked Britain.