Personally, I think you should decide what you really want to do and go for it! Sure, some people apply to 2 programs and it can be done, but I never understood that. I guess I was pretty passionate about what I wanted to do and plan B was to try again. You can always scramble for a slot if you don't make it. Then, you can reapply or just stay in the specialty you scrambled for (aren't there a lot of unmatched medicine spots to scramble for?).
My family is important to me too, but limiting yourself to one small region really hurts you. You may want to rethink this.
If you rank two different types of programs there are scenarios where you could match to your second choice specialty where you may not have if you only ranked one specialty. The Match errs on the side of applicants, but it takes into account both programs and applicants rank lists. So, if you really didn't want to do medicine and your first ranked medicine program was like 7th down, but they rank you really high, then that rank pair might supersede all the 1-6 rank listings. Dang it's complicated.
I can't imagine that applying to a whole extra specialty doesn't detract from both applications. There is a limited amount of energy to expend and you would be dividing it.
Anyways, I understand it can be a tough call and opinions are like @$$&*$&# and I seem to have 2 or 3 about everything...Still, my advice is to reach for the stars.