Please read this document for the (click here) Responsibilities of a Confirmation Sponsor.
The Archdiocese of Milwaukee gives this information regarding sponsors:
While it is allowed that a spouse or fiancé be a sponsor, it is not suggested or recommended. The reason it is not suggested is that the nature of the relationship between the sponsor and the candidate is that of a role model and an initiator into the community, not a relationship of equals, as it is between spouses.
May parents or step parents be confirmation sponsors?
No, but their role in the faith development of their children should not be underplayed or minimized.