Ask HN: How do you explain what you do to your relatives?

I'm guessing others have this experience, the uncle who's the hardware salesman who thinks your sitting at home for the last 12 months and is loud about it, the relative who just nods and looks a bit sad when you tell them what you're doing. All folk who know nothing about startups, IT and what the process is, and with christmas coming I'm dreading it.

Has anyone hit on a magic formula to explain what you're doing in your startup so they'll leave you alone and stop suggesting maybe you can get a job in uncle bob's shop? / you did so well at school / and so on.