Bing gave an awesome response.
3 classes a semester would be considered a joke by many adcoms, although that doesn't mean you can't or won't get in somewhere.
Keep in mind that you had better get a 3.85+ each semester if that's all you're taking.
Good luck with the family business. Don't get me wrong, you'll gain some valuable experiences from working closely with that.
Also, look into night classes. Adding a couple of those to your schedule would bump you 5 classes, which is more respectable and normal.
For example, work at the business full time MWF, take classes during the day on T & Th, and then take night classes on MWF. It's doable, and will give you a great foundation if you pull it off.