Only the spouse who filed the Complaint needs to appear at the hearing. However, the Answering spouse may also attend. It is probably preferable for both spouses to appear. Bring a copy of your marriage license to the hearing and offer it to the court at the beginning of your hearing. If you have a Separation agreement, you should bring that also and ask that it be incorporated into your Judgment of Divorce. You must bring a witness to the hearing. You can not get divorce without a qualified witness.
A qualified witness is a person who is more than 18 years old and who knows BOTH parties, the husband and the wife.
Suggested possible answers include: They lived together, had children together, told people that they were married, I was at the wedding…. ?