Encourage your families to have their child's car seat at one of the Austin area inspections provided by Texans in Motion. They provide 4-5 free trainings monthly, so you can contact Sherrianne Truex-Cabrera at STRUEXCABRERA@sw.org for other dates.
Also, on the NHTSA website, families can also have car seats inspected at:
Hays County Sheriff's Office
1307 Uhland Road
San Marcos, TX 78666
Hours: M-F 8am - 12pm; by appointment only
Contact: Deputy Manuel de La Rosa, 512-393-7373