If you still need this info, this is what I found in another website
RE:Letter of Invitation for ________
To Whom It May Concern:
My name is _________, and I would ask that you accept this letter as my letter of invitation for ________ to visit me temporarily in Canada. I intend to financially support both _______ trip to and from Canada as well ______while she is in Canada. As _______ air ticket will have an expiry date, her trip to Canada will not exceed six months of her arrival date. I have also attached a recent bank statement to demonstrate that I have the funds to support _______during her stay in Canada. ______ will be residing with me during her stay.
My home address is:
For your information, I have included the following information about myself:
Canadian Passport # _______
Social Insurance # ________
Born ______________
Presently employed at ___________ located at _________
Employee of ______ since ***
Work #
In the event that you require further information about me and/or my inviation to ____ _______, feel free to contact me at ________or by mail at my aforementioned address.
Thank you in advance for taking the time to consider my letter of invitation.
Respectfully,
Mr _________
Hope this can help you