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(NECN) - The suspects of the Boston Marathon bombings are just one piece of the investigation.
There are also growing questions about the suspects' families.
Attorney Stephen Huggard is a partner at the law firm of Edwards Wildman in Boston.
He says that one is never compelled to be a witness against their spouse, but because Katherine Russell Tsarnaev’s spouse is dead, she may have to witness against her brother-in-law, Dzhokhar Tsarnaev.
“Because it’s a serious case, that’s why they’re taking it cautiously,” said Huggard.
For the full interview, watch the attached video.