I'm very aware of the responsibilities you speak of. I'm 27, married, have two children (14 month old and a 5 year old), will be taking 13 semester hours in the Spring while working full-time. I was working like a slave for at least 50 hours per week the entire month of November but luckily got hired on at Walgreens as a Pharmacy Tech for 40 hours per week and I start tomorrow.
Not having a job is not an option for me. With two young children and a spouse that makes $10/hour, car insurance, utilities, gas, food, shelter, baby sitter, car maintenance, credit cards, internet, phone bills, etc... I've worked consistently since I was 14 years old, not including mowing lawns at 10 years old, because I've always wanted to have my own money. Just the thought of not having a job just sounds weird to me. Although, last semester, I got a big slap in the face when my work load/school load/family life collided as there were no more hours in the day and I ended up having to drop a class... It really upset me. I've since moved on and will be re-taking that class in the Spring.
What I'm saying is, if you can get away with not working while in school, that would be ideal as you could focus all (maybe not all, but most...) of your time on studying and/or homework. I have a good friend who was an LPN then moved up to an RN. He went and got married and had two children with a women whom was also an RN. He decided he wanted to go back to school to become a PA so she kept working as an RN, let him stop working and she also took care of the kids and also had someone help with the kids at times. Needless to say, he is now, and has been for a couple years, a PA and she doesn't work anymore and watches the kids all day since they can now afford that. I'm sure they did ok as she made pretty good money as an RN and didn't have to pay for child care, and I'm sure he had money saved up as well...
Anyway, what I'm saying is, anything is possible. You can accomplish whatever you set your mind to and I live by those beliefs. In other words, I have no other choice... That's ok though, what doesn't kill me will make me stronger.
Best of luck to you on your future endeavors.