Please call Advocates for the Homeless at 301.662.2003. They can refer you to a group in Montgomery County that can help you.
Have you contacted the counselors at your children's schools? Counselors are up on all resources to help families and can refer you to one or more housing groups that can help you. Once you are working within a group, the group will include education on how to become a homeowner.
Most communities have first time home owner or affordable housing initiatives. These programs will provide discount mortgages and the down payment for eligible homes. Nearly all of them require the prospective home owner to attend classes that teach maintenance skills, household management and setting up budgets. Some work in conjunction with organizations such as Habitat for Humanity and involve the prospect in additional activities such as the home construction process. As you can see, all of these require some lead time before you can move-in.
Call your city and county leaders to determine the programs that are available to you. You may even consider reaching out to a real estate professional for advise.
You would be well advised to be proactive. Cities and counties are all facing incredible budget challenges and you will need to press hard to prevail in this endeavor.
Best of success.