It's easy and convenient; plus you can manage to club your responsibilities well. You can not only make extra income, but also be able to keep an eye on what's going on in the house as well. Keeping that in mind, we will see some part-time work for teachers who have other responsibilities as well.
Apart from these jobs, there are other self-employment ideas you can venture in.
If you don't have to be home at all times after coming back from school, you can opt to work outside home. Even though there are different ways to make money from home, you can search for another job that doesn't require you to stay home for it. The point is to make money, and whether that is at home or elsewhere, it doesn't really make a difference.
The only thing is that even after working at school, you need to have enough energy to work attentively. So before you get into anything, make sure that you are committed and will be able to handle the responsibilities from both jobs properly.