I don't know why, but that bothered me. So, I bought a home test kit on ebay and just ran the test. It was an Eldoncard kit and I paid less than $10 for it on ebay (and yes, that includes the shipping).
The test itself was very easy to do, I just needed four drops of blood, a little water, and the stuff that came with the kit:
- 1 Eldoncard 2511-1
- 1 lancet (needle)
- 4 Eldon sticks (mixing sticks)
- 1 alcohol swab
- 1 cotton ball
- 1 plastic pipette (eyedropper)
- Instructions
- You also need some tap water (not included)

And now, the mystery is solved. I am A negative.
It's funny, but my older brother (a dentist) predicted that would be the result, based on heredity and that being the type my three brothers have. I don't know what blood type my sister has.
Here's the info on the procedure: http://www.eldoncard.com/
(check the Video/Procedure link at the bottom of the screen)
or
You can see a higher quality version on You Tube:
http://www.youtube.com/watch?v=0ZvmaH3kozY
I bought the kit on ebay for under $10 (including shipping).
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Funny thing: the kit comes with a pop-out lancet that you're supposed to just jab yourself with and it will poke in the appropriate amount. But I couldn't make myself use it. I guess it's because I'd never used one on myself before and wasn't sure how deep it would go, how much it would hurt, etc. I was more comfortable getting a fresh Xacto blade and using it to poke myself (and make a small cut) because -- having done that COUNTLESS times while working on miniatures -- I knew exactly what it would feel like. It didn't really bother me at all.
By the way, Donna is so needlephobic that I didn't tell her about this. I didn't want her to get all worked up thinking about me poking myself with a needle. I'll tell her sometime tomorrow.