Originally Posted by Morph Bark
From what a friend majoring in Biology told me yesterday, stuff such as eye colour can be weird. There are just so many genes that help decide it. Hence why I am the only green-eyed person in the family, for example.
This, I'm afraid.
The advice earlier in the thread works if we assume that eye color is controlled by a single gene, with each person inheriting two alleles--under those conditions we can build our Punnett square and do some simple math.
As it's been pointed out, that's not, in fact, the case. Eye color isn't a simple Mendelian trait, which more or less invalidates the math.
In this case, though, that may well be good news--the study describes eye color as being the result of variation within three base pairs on the OCA2 gene (the eye-color gene formerly believed to operate on a simple Mendelian basis), with each possible combination of bases in the pairs creating a different eye color.
Which would mean that, since both blue and hazel are present in your or your co-parent's families and none of these traits is simply dominant or recessive, both blue and hazel are distinct possibilities; the study implies that you do not in fact need two copies of any allele to have any given eye color, so even if you have only the brown-eye block to pass on it won't automatically mean your son or daughter will have brown eyes. If you've got the block for blue or green/hazel as well--possible, since your aunt has (lovely) green eyes--and your co-parent has only the blue-eye block (ask about her parents and grandparents), you could have a fifty or seventy-five percent chance of blue or hazel, barring weirdness (to which eye color is prone).
is the actual study the Science Daily article is referencing, in case you're up for some pretty dry, technical reading. It'll give you a more accurate picture of the science--the article linked earlier is pretty massively oversimplified--but it's pretty dense.
Also, adding my voice to the chorus; you seem remarkably gung-ho about making a lifetime commitment to a woman you've known for two months. Even if you have pre-settled any custody arguments, I'd question whether it's fair to your future son or daughter to run such a large risk of eventually having to raise them with split parents. I know that plenty of kids grow up just fine with their parents separate, and I don't doubt that you'll both love your child very much, but it's something to consider for, perhaps, a bit longer than two months.
Whatever you decide in the end, best wishes. The Playground has your back.