I may be late to the party, but just in case I'll give you my two cents.
So your bride to be (congratulations) wants to learn photography (congratulation again).
From what I have read in the comments is that the solutions that were offered to you mostly direct your future purchase toward either Nikon or Canon. I, on the other hand, would suggest you to perhaps consider Pentax.
That's what I started with 10 years ago and I am still with them today. Their "beginner" cameras are good for beginners, meaning they are very good to learn the fundamentals without being buried under tons of "ultra advanced" options. So they allow you to get a good grasp of the fundamentals but also help you defining what you want to do: portrait, landscapes, macro, etc...
Another thing that made me choose Pentax, actually two other things.
-most of their cameras are weather-sealed. That was 10 years ago, I think this is now standard for all of their cameras now. So shooting under the rain is fairly safe.
-price of the lenses, and that is something I think can be very interesting. Contrary to Canon and Nikon the stabilization system is located inside the camera and the lens. Which means that, each time you buy a new lens you are not buying a new stabilization. Which means the price of a lens is way lower. Which is a good thing if your bride to be fells for the "lens-porn curse" (and that is something that happens to a lot of photographs).
So, yeah... a cheaper alternative.
But if your brother and dad both have D3000, with various lenses, it could be a good idea to go with a D3000. That way your bride to be will be able to try different lenses and find what she wants to do and/or what she wants to specialize in.