If they are employed, have them get letters from their employers stating how much time off they are being allowed to take from work to escort their daughter to the US, and when they are expected back at work.
If they are self-employed, show the latest tax returns filed for the business, and the company documents showing their position as owners/shareholders.
If they own house/land, show a copy of the title.
The need to show proof of ALL their ties to Pakistan, not just that they can afford to take her to the US.
thanks charlie, ur answer is quite satisfactory and i think it gives some sence to apply 'with what extra documents with.' i'm going to support him by using ur advices ,so that somehow i can help where is possible and may be my this effort will save his daughter's life.
this is his 2nd child with the same prob,he lost one in past with the same issue and even the age was 6 of that child when she passed away .
he runs own business and yes pays taxes .thx