There is something grandparents can do to help protect their unimmunized or inadequately immunized grandchildren... Get your own shots so you are not the one giving the preventable diseases to your family. This means
1. Yearly influenza
2. Once in a lifetime Adult Diphtheria/Pertussis/Tetanus. This is not the same as the tetanus shot you might get for an injury as that only contains one disease. If you don't tell your doctor you want this, you will not get it.
Updated Recommendations for Use of Tetanus Toxoid, Reduced Diphtheria Toxoid, and Acellular Pertussis (Tdap) Vaccine in Adults Aged 65 Years and Older — Advisory Committee on Immunization Practices (ACIP), 2012
3. Prevnar-13 This is a routine early childhood vaccine which reduces illness from 13 strains of streptococcus pneumonia (pneumonias, meningitis, ear infections and more). This vaccine is now recommended as a single dose for all adults 65+. There is an additional pneumococcal vaccine also recommended with 23 strains. Specific information is here:
Vaccines: VPD-VAC/Pneumo/In-Short
4. Varicella/Shingles vaccines If you have shingles you are capable of infecting non-immune persons with acute chicken pox.