letter of invitation - personal or formal?

[ultra99]

My sister is writing me a letter of invitation, should it be personal as if taliking to me or formal directing CIC or visa office?

 

[steaky]

Personal.

The below is an example written by another poster. Unlike that poster, you don't have to notarize:

http://www.canadavisa.com/canada-immigration-discussion-board/supervisa-from-bangladesh-t93529.0.html;msg1778669#msg1778669