By News staff
Tamerlan Tsarnaev's in–laws testified before a Grand Jury in Boston Thursday afternoon.
Judith and warren Russell's daughter Katherine was married to Tsarnaev and is a "person of interest" in the marathon bombing investigation.
She has been staying with her parents in North Kingstown in the months since the attacks.
An attorney for the Russell family says neither Katherine nor her parents knew anything about Tsarnaev's plan to bomb the Boston marathon.
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