You can do it, but make sure your spouse knows what you wrote, understands what you wrote, and agrees with what you wrote. If possible, give your spouse a chance to edit or make changes to what you wrote before sending in the forms.
I've seen a lot of appeal case where the applicant had a different story in the interview than what was written on the forms and wasn't aware of what was on the forms he/she signed. You don't want to get into such a situation, so be careful. If your spouse doesn't read well in English or French (which ever you used) make sure that he or she has an accurate translation of what's on there.
