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

It takes a window frame of about 10 to 21 days for someone who hasn't had chickenpox to catch it from someone who is currently having chickenpox. According to online article, taking the vaccine within 5 days after being expose reduces the risk of getting chicken pox or at least reduces the severity of it. Here's an online article should you need more information: http://www.thedoctorwillseeyounow.com/content/infections/art2865.html