QUOTE(** LoVe ** @ Jan 30 2008, 11:30 AM)

I am soooooooooo confused. Whoever responds please make sure you have atleast either passed the interview and had a co sponsor or know of someone who has done so. Thanks!

This question confuses many people but the first clue that the question is not asking how the sponsor is related to the sponsor is that when there is only one sponsor, the answer would be self. The question asks how the beneficiary is related to the sponsor. The preceding question asks for the beneficiary's name, then "relationship to sponsor". They want to know the beneficiary's relationship to the sponsor. For a sole or primary sponsor of a K1 or K3 visa applicant, the answer will be spouse, fiance, or fiancee. With the petitioner's mother as co sponsor one would write fiance's mother or mother in-law.
For K2 or K4, adjust as needed.