You didn't really specify what your home situation is, but I'm going ahead and responding as someone in a relationship who has returned to school. For full disclosure, we don't have kids. But DH and I both returned to school as adults, and I did a seminar speaking with the spouses of adults returning to school who did have kids. We all got and shared some great tips -- all of the below tips were ones that we follow and I also learned that those with kids found worked best in the long run:
One -- if you're married, in a relationship, or co-parent with someone, it's very hard to do this if you aren't a team. Heck, even the kids have to get on board. They need to know that this may be your thing, but he/she is absolutely going to "suffer" right along with you. He/she is going to have to take up some slack, learn flexibility, and learn to put socializing/events/family-time off or do without b/c you have school to do. But as long as they know this won't last forever, and that there are greater rewards at the end, you can do without now. They also need to be able to kick you in the rear or give you the reassurance you need when it gets hard and you feel like giving up. And you have to be able to listen to them vent now and again about how hard it is for them. Patience, understanding, teamwork.
Two -- THE CALENDAR. So VERY important. You need to write down EVERYTHING on a calendar your family can easily access. DH uses both one of those really large eraseable calendars as well as sharing his Outlook calendar with me. When you register for classes, write down those class dates and time (and room #'s in case of emergency) for every day you're in class. Then, when you get your syllabus, write down when papers, tests, etc. are due. This will let your family know those periods that you won't just be studying, but will also be ramping up to something important. With DH I know that in the weeks between projects, he can be a little more flexible, has more time. But, for instance, the weekend before a test we don't do a single thing. His job is to study.
Three -- get help where you can. I edit (heavily sometimes
) DH's papers -- he's a computer guy, I'm a lit gal. After finishing a paper, he hands me the source material and I complete his MLA citations/bibliography for him. Often, I help him research, or I go to the library to pick out some books for him to peruse. I don't do his work for him, but I certainly serve the function of tutor, editor, clerical assistant. Helping him is self-serving in the end as it decreases his stress and frees-up some time for us to do family things.
Four -- Set a die-hard study schedule, and make it non-negotiable. Now we both know in emergencies it will flex, but start out with a "Mom/Spouse will be studying every night from 8-10, and every Saturday/Sunday from 2-5 and 8-10" or whatever works for you, of course
Your job is to learn to turn away requests that others can handle perfectly fine without you, and ignore the guilt of doing so. It's not easy. Your spouses job is to learn that he/she has to pretend you aren't even in the house during those times. They'll have to figure it out for themselves. If you don't have a study you can claim for yourself, set up a study center in your bedroom and shut the door. Lock it if you have to. If noise is an issue, buy some headphones and play some music that won't interphere your studying.
Five -- and from a budget standpoint, going to classes can be a budget buster from the eating side. If you physically go to classes, for working adults, that's often during meal-times. You can get into the trap of snacking at vending machines, or eating meals at the campus cafeteria, but it adds up. The days DH goes to school, I pack him a lunch and a dinner. He will eat dinner at work right before he leaves (about 5 pm), and I pack snack bars/water for him for during break (around 8 pm). Sometimes when he gets home he'll have another snack. Otherwise, for instance, I forgot to pack him a snack the other night and he spent $4 just getting a water, pack of gum, and a snack. And if he'd also bought dinner? Ouch, it would add up.
I'm not saying you'll accomplish any of this overnight. It may take 3-4 semesters before you get it down. And the resentment will flare-up suddenly sometimes from the spouse/kids, and you'll fall off the wagon now and again when you get burned out. But like any good "diet" you just get back on that horse, or talk it out, and you'll make it.
Best of luck to you.