Additional District and Sessions Judge Kanhaiya Ram held the three guilty and sentenced them to 10 years of rigorous imprisonment.
The judge also slapped a fine of Rs 5,000 each on the convicts.
According to the prosecution, Soni Devi was killed by her in-laws on June 13, 2012 at Mukundpur Gopinath village, under the Jandaha police station of Vaishali district.
The woman was killed by her in-laws for her family's failure to fulfil their demand for a four-wheeler as dowry, as per the prosecution.
Those sentenced to 10 years of imprisonment were the deceased woman's grandfather-in-law, Rameshwar Singh, father- in-law Krishna Singh and brother-in-law Basuki.
The police have declared the deceased's husband and sister-in-law as absconders.
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