Two people still isn't much for a game of this caliber. When you look at it, you don't have an advantage over nintendo, you have a disadvantage, because nintendo had huge numbers of people working on the games, and it's their job to work on it. Not to be discouraging, but it's a huge task. You're gonna have to be looking at over 10 years work (i estimate) if it's only u and a partner, (And we all know the world is gonna end in 2012 lol...). You should try to figure out the scope of your game, and if you can stick to it for that long. Even so, things change, and many people who say they'll stick to it, stop in a couple months.
Mhm...
And actually, if each women were to bear lets say.... quadruplets, then you would have 36 babies in 9 months =D