My friend who will be joint sponzor have very good incom in 2006 now,but in 2005 his incom was not good because his wife dosnot work in 2005 because school and pregnency.Can they be legal sponzor if incom in 2005 and 2004 was under poverty line,butnow in 2006 they make very good incom over poverty line? please help me