questions please..HELP

[LOSTGURL--SOPHIA 2]

the consulate is asking for a letterhead from the employer

what if in the case of my father its just a private person who request

him to be taken care of?

1) what we submitted on the 18th is a letter with the name, address, telephone no

at the center of the page. (upper center of the letter--bold letters)

and the certification letter with salary rates?

what do they mean letterhead..its its a private employer not a company..if we cant

provide a letterhead what are other options?

2) and they are requesting for i864 with my dads' mailing address and the residence

address, is that possible?

4) what is i864 A signed by his wife?

5) what is rental..contracts?, can someone explain what else can we show

for my dads' assets properties..can someone give me an example?

any help is highly appreciated...thanks...=)