OMSCS grad here. The awesome thing about the program is its flexibility. Some of the courses are definitely more time intensive, but I think if you took only one class and dedicated about an hour a day to the course materials, you'd be in good shape. (I know that's still a lot to ask of someone with two young kids.)

There's no way to get through the harder courses in the program on 1 hour a day. And you're not getting value from the degree if you aren't pushing yourself to take those hard courses, unless you just need the diploma.