[date]
To Whom It May Concern
Subject: Invitation for [full name(s) as in the passport] to visit the United States
Dear Sir or Madam,
I am writing to invite my parents, [full name(s) as in the passport], to visit me in the United States from [arrival date] to [departure date]. They will stay with me at [address in the United States].
I am a U.S. citizen. I live at [your address in the United States].
They live in [home country].
The purpose of the visit is to spend time with family.
My parents will pay for their own travel and expenses.
They plan to return to [home country] at the end of the visit. I understand that they must leave the United States before the authorized stay ends and that the decisions on the visa and on admission belong to the U.S. officers who review them.
Please contact me at [phone number] or [email address] if you need any further information.
Sincerely, [your full name]
Enclosed: a copy of my U.S. passport.