Depending on how the interview is proceeding and structured by the interviewer, you will have to decide. However, as a general rule, you need not volunteer personal information like the one you are basing your question on. All personal information that will help justify your suitability for the job should, of course, be presented tactfully if it is not covered in the interview.
But you must not shy away from handling questions such as those you are concerned about. Share such information if asked, but take care to avoid creating any perceptions that you may be attempting to gain mileage from such personal information.
I trust you have the answer now. If you wish to raise more questions, kindly do not hesitate, as interviews are a critical phase in the recruitment process. They must be handled truthfully but also tactfully!
Regards,
Samvedan
September 16, 2012