Unless he is 245i eligible, he cannot adjust status to green card even if he marries a US citizen. Instead, he may be eligible for cancellation of removal which requires 10 year residence in the US and good morale character and most importantly, if his removal would cause extreme and unusual hardship to you and the children. Please consult immigration attorney for advise.
Answered on Aug 23rd, 2011 at 8:00 PM