There is no way to predict.... how it will be, ahead of time.
Per your schooling and how that will go, per your kids and how they will do, per your graduating and getting a job in your field, per how your family will handle it and everyone living under their roof, per how you and the kids will handle it... living with your parents and under their roof, per how your kids will adjust to moving and having friends, then after you graduate... moving back... to where you used to live? Per you and your kids moving out of their Grandparents home to move back to where your Husband is? Per not seeing their Dad... and how their relationship will be with them, per your children's special occasions and Daddy not being there to see them grow up, etc. etc.
And, will your schooling, take only 1 year, finitely???
How is your marriage? Solid? Trouble free? Trusting?
Is your Husband reliable? A go out with the guys to bars type, or a domestic type?
Can you handle a long distant marriage? I know its only 4 hours away, but still, you will not be together. And how will your kids, adapt?
What if, only you go to school and live with your parents?
Can your Husband handle being a "single parent?"
Your 2 year old can go to Preschool.
Your 6 year old will be in school anyway.
Your classes as you said, are 10 hours a day.
Is there no school, nearer to your home?
Will your Husband, be able to make these sacrifices, too? Not seeing his kids, not seeing you, and he being the one that will most likely be expected to do that 4 hour traveling, to see you and the kids at your parent's home???
You said your schooling, will be 10 hours of school a day, plus you need to think that there is also studying 7 days a week, plus any other class/degree requirements. Your parents, will also NEED to know... full well, that THEY will be care-taking of your kids, mostly.
My Husband, was in school too to finish his degree. We have 2 kids. He spent, 7 days a week, night and day, studying. In conjunction with attending his classes. And he worked full time too. During his time in school... I was like a "Single Parent." And he could not attend many of our kids things or family special occasions, because, school took up a lot of time and studying. And we did not have a lot of face time. And we live in the same house.
You are not selfish.
But... you need to think about all of the scenarios... of which this will cause, upon everyone. There is you, the kids, your Husband, your Mom and Dad.