E.T.
Full time law school is going to take up 60-70 hours of your week between classes and studying. My husband graduated from law school a year before our kids were born, and I can not imagine him doing it with kids in the house. But if you're committed, you can accomplish anything, right?
That said... please please please make sure that you have the finances to cover law school. It's expensive! You don't want to go into debt to learn a new skill if there isn't a well paying job waiting for you... and the vast majority of new lawyers nowadays don't make nearly as much as people think.
Personally, I'd do the full time because it sounds like if you do night school, you'll never see your kids.