Jay2013,
you should send I-485 and all other related documents together,however we did separate our documents into different transparent files...By separating, you avoid confusements...do not staple your documents.
Hope it helps.
Japakak
Obviously, it is helpful. Thank you very much for your information. I do have additional questions?
Do we need to find sponsor for all of three given that our family income is $22,000. If so, can single sponsor can sponsor for all of three? I know, we need to submit I-134 separately for each person. But just wonder whether one sponsor would be sufficient or not if he/she has income level higher than 150% of federal poverty income threshold?