Urgent help-Questions regarding self-sponsored visitor visa for parents and sister

[shshah]

I live in USA with my husband. My husband is on H1 and I am on H4 visa. My parents and sister are planning a trip to USA this July. They are showing self-sponsored in the visa application. I have few questions:-
1) As they are showing the full trip as self-sponsored, I believe we don't have to send I-134 form.Is that correct?
3) Do we need two letters, one to consulate and invitation letter for family?
3) Will there be only one invitation letter for all 3 of them?
4) In the invitation letter I will also add my name and sign along with my husband, so do we address my parents together like "Dear father, mother and sister"?
5) As they are self-sponsoring, what do we mention in the letters? Do we need to mention that they would be managing their own expenses for their trip within USA? Do we need to mention that they would be staying with us during their stay?
Any help would be appreciated
Thanks

[peace999]

1.correct.
2.No.One. Address it to the consular and send it to your parents.
3.Yes. one.
4.Your husband does not need to sign.You send the letter from your side only as they are directly related to you.
Mention your and your husband's job and visa status in the letter and send copies of your husband's approved petition,
,your and your husband's passport + visa, I-94s.
5.Mention that they will be totally self-paying for the whole trip and you will be providing lodging.

Most often they do not even look at the invite.

[shshah]

1.correct.
2.No.One. Address it to the consular and send it to your parents.
3.Yes. one.
4.Your husband does not need to sign.You send the letter from your side only as they are directly related to you.
Mention your and your husband's job and visa status in the letter and send copies of your husband's approved petition,
,your and your husband's passport + visa, I-94s.
5.Mention that they will be totally self-paying for the whole trip and you will be providing lodging.

Most often they do not even look at the invite.

Thank you!!