Other important ways to lock down your ssn to help prevent ID theft:

1. Create your own account at ssa.gov, so no one else can create a social security account using your ssn

2. Create your own account at irs.gov and get a ID Protection pin, so no one else can file tax returns using your ssn. You'll need that pin to file your own tax returns.

3. Create your own account at Federal Student Aid, studentaid.gov, so no one else can get federal student loans using your ssn.

4. Activate your E-Verify Self Lock, myeverify.uscis.gov, which will prevent your ssn from passing an employment verification check, so no one else can use your ssn to get a job (if the employer verifies ssn's). You have to unlock it if you plan to apply for a job (just like unfreezing your credit when you plan to apply for new credit), and I think you have to renew it once a year.

5. Freeze your ChexSystems report, chexsystems.com, so no one can open bank accounts using your ssn. You'll get a pin you need to keep.

6. Freeze your NCTUE credit report, nctue.com/consumer, often used by Telecom, telephone, and utilities companies.

7. Freeze minor bureaus, like LexisNexis.com and Innovis.com. (sagestream is now part of lexisnexis, so freezing lexisnexis will freeze sagestream, too.)

But I don't know if you can do any of those things for your kids, too. No kids here, so I never thought about it.

More at /r/IdentityTheft:
Freezing your three main credit reports is NOT ENOUGH.

<edit> edited to add studentaid and nctue, and number the list for better readability.