N. -- I feel for you as someone who's been there, done that. I went back to school full time while working full time and it was hard on the kids. I was fortunate to be living at home with my parents, but it didn't make it any easier to see them spending all this time with my parents.
One of the things that my dad suggested was a "mommy day" or "mommy time". It served 2 purposes...it gave my parents a break and it allowed the kids and I to do something together. More often than not it was Friday night (we kept it as consistent as possible so that we all had something to look forward to) and I would get home from work and we'd order a pizza and play games.
I also made homework time something that we all did together when I needed to work. If I was working on my homework, they would be working on activity books or coloring so at least we were all at the table together. We also did this with reading.
One other thing that I did was explain to them why I was going to school. I wanted to instill in them that I was trying to better myself and the job opportunities that would come as a result. And I shared my papers/report cards with them just as they did with me. We all had papers hung on the fridge.
One other thing we did was post all of the classes that I had to take to finish my degree. I let them cross them off as I completed them.
I have to tell you...my kids turned into my biggest fans and over time they would ask ME if all my homework was done and I would hear them tell everyone what I was doing in school and they were so proud of me. It kept me going.
I've been out of school for almost 4 years now and we spend more time together and every once in awhile the older one will tell the younger one "you know, we got to go out to eat tonight because mommy went to school and got a better job so we can do more fun stuff"....they know...it's just a matter of getting them to see the importance of what you're doing.
Hang in there!!! You CAN do it!!!!!