Okay, I know it's really difficult to go back to school when you have kids, but it's really good for you (and in more than one way.)
First of all, taking classes make you feel really good about yourself. Don't have time/money to go full time?
Don't.
Start off small. Take one or two classes a semester and you can gradually build up to where you're taking more classes. It's better to break into it, anyway, so you don't overwhelm yourself.

Need another reason? You can make more money with a degree. Even if you don't obtain a degree, there are still ways to make more money by taking only one or two classes. If you take a medical terminology course, you can break into the medical field. There are a lot of jobs in the medical field that only require this course. There are also CNA courses, first aid, and CPR. Not interested in the medical field? How about a job as a secretary? Just by getting a Microsoft Word and Excel certification, you can shine on your resume. Get your typing skills down pat and you're in like flint!

Don't have the money to go back to college? There are two tax credits out there as well as the fact there are many employers who reimburse up to 100% of your tuition.