Is it too late to get chicken pox vaccination for the other family members if one of the family member has already infected ?

Definitely visit your doctor and get a vaccination asap!! When did your family member contract chicken pox? I have linked couple of articles both of which agree that vaccination helps even after being exposed. http://www.cdc.gov/vaccines/vpd-vac/varicella/basic-vacc-after-exposed.htm http://www.thedoctorwillseeyounow.com/content/infections/art2865.html