I will leave him out of it, but does this number include what my step-dad made? This is now sooo unnecessarily complicated, and requires me to go digging into areas where I should just let sleeping dogs lie.
I actually just finished the application cycle (but I might wind up re-applying), and I was never asked any detailed questions that required me to know the finances of my parents for 18 years.
My point is that the number is absolutely meaningless. If from when I was 0 to 7, we lived on $5000 per year, and then my mother married a bazillionaire, the average would be a lot. But that totally discounts those years when I lived on $5000 per year. It's just a crappy designed question in my opinion designed to see if parents can pay for medical school out of pocket. It doesn't tell a whole lot about the applicant.
I wouldn't worry about this; they aren't going to track down your family financial history from the IRS or anything. (Honestly the last thing the admissions guys/gals want is more work).
IMHO, put down reasonable numbers (don't lie and make yourself out to be disadvantaged if both your parents were physicians or something) but don't be terribly concerned with accuracy. This isn't a 1040 or anything.
Again, I'm just annoyed at the required contact information, I do not want them calling my current employer and giving them [employer] a reason to cut me loose at will.