I assume this is part of the divorce proceeding. This is called "discovery" and is where parties to a lawsuit get information about the suit from others. The 30 days is from the date the discovery was served on you. There should be a "certificate of service" included with the documents (usually the last page, but not always). Check that date to see when they sent it to you. Most of the time they are mailed, and if you received them in the mail, add 30 days plus 3 days (to account for mailing delays) to the date of service in the certificate, and that's your answer date.
I assume from your asking this question that you are not represented by counsel. That is your right, of course, but realize that it is very dangerous.
I am an attorney licensed to practice in the state and federal courts of Texas only. Any responses provided herein are offered for educational purposes only. No attorney-client relationship is created through the use of this forum, and cannot be created through asking and answering questions here. You are strongly encouraged to hire a lawyer.
Sign up to receive a 10-part series of useful information and legal advice about the divorce process.
Years licensed, work experience, educationLegal community recognition
Peer endorsements, associations, awardsLegal thought leadership
Publications, speaking engagementsDiscipline