Doubt in DS-156

[visa4us]

Hi all,
I am planning to bring my FIL and MIL for first time.

I have some doubts in form DS-156.

In Q.20 Name and address of present employer or school name .

my fil is doing business, what should I fiil in here?

In Q21. Present occupation

is it ok to write business

in Q22. when do you intend to arrive in US?
Is it sufficient to write Immediately after getting visa or any tentative date

in Q28. who will pay for trip?
Son-in-law or my name should be explicitly specified.

In Q37. fill in all the persons in Us and their status
Should I enter my name and my wife name and our status?

Thanks
Kavin

[immihelp]

20. Write whatever the name of business is.
21. Mention what type of business.
22. Write tentative date.
28. Son-in-law and then write name.
37. Yes.