I have a few suggestions that hopefully you will find helpful...
Bring over a pamphlet or two, explaining the basics about diabetes, to your boyfriend's house. You can pick some up from you CDE, doctor's office or even from the JDRF of ADA. Then, just casually mention: "Oh, I brought these over in case you were interested" and leave them on a table. The parents will most likely pick them up and read them, but probably only after you're gone. Then, maybe a week or so down the road, you could ask, again casually "Did you happen to get a chance to look those over?" If they have any questions for you, they'll be a little more prepared.
When your boyfriend's mother is making dinner, insist on helping her! Most people wouldn't turn down some help with, for example, peeling potatoes! Besides creating a closer bond between the two of you, you can keep an eye on her and when you see her about to throw out some packaging, just mention "Oh, before you throw that out, could I have a look at it? I'll write down on a piece of paper how much I'll be able to eat at dinner... You know, that whole carb thing... Hah!" Make it almost seem like a game and I think she'll eventually get it. Remember that as much as this is relatively new to you, you have the experience with your father, whereas it is completely new to them. It's a matter of creating new habits, which can indeed take time!
It certainly sounds like you class schedule is hectic! The only thing I can suggest is to always have something quick on you to eat, like some granola bars (I like the Nutrigrains!) and maybe some cheese strings. I'm sure if you also approached your teacher/prof about finishing up a light meal during the beginning of class, it wouldn't be a problem, given the circumstances. Granted, I'm not talking about a huge piece of pizza (you would have a lynch mob after you!!!), but maybe a sandwich. As long as it didn't interfere with the teaching, I'm sure he/she would understand.
Good luck, Courtney!