I'm really of two minds about this. I think if you are very confident, go ahead and say. If you're a conversational pro, do the dance as mentioned above. And if you are neither confident nor a conversational pro, PREPARE. This is a question, in more or less oblique terms, that you are almost guaranteed to be asked.
If you get asked a truly offensive question like how much does your dad make, I'd feel free to answer it's none of their business, or any of those mentioned above. But most inappropriate questions are snuck in so you don't realize it until later. I'm sure I talked way more than I should have about my Dad the photographer. I didn't think much of it because he's a larger than life character so people have asked about him my entire life. But in retrospect I realize I was being asked what my dad does for a living a lot. Also, in retrospect, if I'd realized that, I would have made him seem more financially successful than he actually was
