First they were saying the brothers had been here a year, and had previously received military training in Russia/Chechnya.

Now they're saying they've been here more than 10 years, and went to middle school and high school in Cambridge...and were/are essentially very Americanized. Apparently there's a sister somewhere, and the father at least is back living in Russia.
"I don't know! I don't know why I did it, I don't know why I enjoyed it, and I don't know why I'll do it again!" -BART SIMPSON