It really depends...sometimes my dh is supportive, and sometimes he blames me for being in the rut we are in. I'll tell you that he can't wait until I am done and working, though! Other people (mother, father, in-laws, grandparents) are all over the place.
At first my dad wasn't very supportive, thought I should go back to work and help support the family. But, I think that as he has seen me persist in my endeavor he has come to realize that I can do it and how important it is to me. He is very proud of the fact that I have 3 kids, limited money, and still a 4.0!
My mother has never really said much on the subject...she herself went back to school when she was about 31, and now has a masters. She does think that nursing is a good idea...you can get a job anywhere.
My mother in law has hardly been supportive at all, telling me she doesn't know what I'm going to do, that I shouldn't spend so much of my time away from the kids, I have a family I need to take care of, etc, etc.
My father in law has been supportive, though he generally isn't the kind of guy to tell you these things, except every once in awhile. He has said my dh shouldn't move me, I am committed for 3 years to the program, and I think he thinks it is a good idea...what I am doing.
Of everyone, my grandmother has been THE MOST SUPPORTIVE PERSON. She has told me that I can do it, to stick to it, and good job! I am so thankful just for her little words of encouragement.
It must be hard for those who don't get any support, and I know it is difficult when some people don't support you!