HERE YOU GO!! You need to change the content a bit though. The letter should be from you to the head of American Consulate General
American Consulate General,
Sub: Issuance of visitorís visa to my <>>>
I, , work as a at located at and earn per year. I would like to invite my parents, Mr. and Mrs. , to visit USA for tourism purpose and to meet me. They will be staying with me at my home at the above-mentioned address for <6> months.
During their stay in United States, I will bear all responsibilities including, but not limited to, financial responsibilities, return air ticket fare to travel from to USA and back, travel expense within USA, medical insurance, housing and food. I will personally make sure that they leave United States before the expiration of their authorized stay. I will also personally make sure that they will not become public charge on the part of United States government.
So I respectfully request you to grant my momsí visitor visa.
also dont for get to notarize it - here is how
If you receive documents that need to be notarized at an office, ask the person giving them to you. Sometimes, there will be a Notary on staff. Do it then rather than risk misplacing the documents or searching for a Notary later.
Call an insurance agency. Because they generate so many legal documents, a Notary might work there.
Contact the local post office. If the document needs to be mailed, it could be signed and sent in one place.
Ask someone at your bank. They could offer free notary services, depending on the type of account you have.
Call your public library or the local court house.