Hi, Have you tried contacting the Stockton Unified School District to see if they can assist you with placement at an alternative school? Here is their page in SchoolFinder which lists their phone number:

http://www.education.com/schoolfinder/us/california/district/stockton-unified-school-district/

Another resource you might consider is virtual schooling. More information about that can be found here:
http://www.education.com/schoolfinder/us/california/california-virtual-academies/

I hope one of these resources is helpful to you in finding the right school environment for your boys. Thanks for asking!