DS-160 form completion for Government employee(Travel Information) / Letter of Invitation

[shivaswathi]

I need help, currently i am on H1b visa and  i am inviting my brother in law and my sister (B1/B2) visitor visa for 2 months summer vacation. My brother in is a government employee.

Question 1: 

While i am completing  his DS-160 form,  in TRAVEL INFORMATION section -"Person/Entity Paying for Your Trip" - which one i need to select among these three " self " or " other person" or " Other company / organization" ?

Because he is a government employee? person paying for the trip " Self  " or " other person"?

 

Question 2:

When i am providing a INVITATION LETTER  should i mention all expenses, including US visiting flight charges   from INDIA to USA,  to and fro charges...so and so...will be incurred by own.. 

Please advise me the letter of invitation for the government employee .. provide me a  draft letter.

Thanks

Shiva