Form DS-230 relates to your husband and all information on the form must relate to him. Part I questions 15-18 relate to his parents not yours. Part I question 12 and 13 refers to his occupation, regardless of where he does it and his present address, obviously since he is in Mexico he should use his address in Mexico. Your address will be in question 16.
Ensure the accuracy of information provided on the form as it will be difficult to change it at a later date as inaccurate unless it was a simple error. At best have someone look over the form if you are unfamiliar.