I agree. I wouldn't tell them anything more than you needed to and then if they asked what the "family matters" were it would be very tacky and probably illegal.
Thing of it is, you could never prove that that's why you didn't get the job, even if you know darned well that it was! My daughter had the same thing the last time she was looking for a job. She's a nurse and a darned good one and has been one for 14 years, since she was 20. She has never applied for a job that she didn't get! She was unhappy where she was and was looking for another job when she found out she was pregnant. She interviewed for two different jobs and told both places that she was pregnant because she thought it was the right and honest thing to do - and she never heard from them again! The third interview was the job she really wanted. This time she kept her mouth shut about the pregnancy and she was hired on the spot! They learned soon enough because she pudged up very fast, but by that time they considered her a valuable employee and didn't want to lose her.
