US Consulate General in XXXX
RE: Visa application for XXXX and XXXX
Dear Sir/Madam,
This letter is to certify that my wife and I are inviting my parents-in-law, XXXX and XXXX to visit us in XXXX, USA, and we will pay all the related expenses for them.
My name is XXX ... My wife XXX is a homemaker and ...
My son is a ...
Blah-blah............
We would be very pleased to cover their air tickets, boarding, and all other expenses occur during their trip and stay in US.
Thank you very much for considering their visa applications. If you have any questions, please do not hesitate to contact me.
Yours sincerely,
XXX