To whom it may concern:

　　I am writing th letter to invite our parents (name and brithdays) to vit us in (country) th coming (month) for aperiod of 6 months.

　　It goes without saying that we will cover all expenses duringTheir vit in (country), which includes international air tickets, local transportation, accmodations, medical

　　insurances and all other related expenses.

　　Your favourable consideration regarding their va Applications will be highly appreciated. If you have any question regarding th matter, please kindly contact me at the address above

　　Sincerely,