to whom it may concern:

　　i am writing this letter to invite our/my parents (name and pith days) tovisit us in australia this coming may for a period of () months.

　　it goes without saying that we will cover all expenses during their visitin australia, which includes international air tickets, local transportation,accmodations, medical insurances and all other related expenses.

　　your favourable consideration regarding their visa applications will behighly appreciated. if you have any question regarding this matter, pleasekindly contact me/us at the address above.

　　sincerely,