My brother & I presented with chicken pox the day after our newborn brother came home from the hospital. I believe Newby got a shot of gamma globulin & was fine (he got chicken pox several years later).
The same brother who got chicken pox when I did, also got measles when I did. We both had German & Red measles the same summer. I can remember mom keeping us in a darkened room & ‘bathing’ us in alcohol to get the fever down (common practice then, not done now). Our pediatrician made house calls & stopped by once to check us out. We recovered just fine.
Once my older brother started school, he brought all the childhood illnesses home to us girls. The family doctor would come over and give us girls gamma globulin shots. Those were the days.
I on purpose exposed my kids to chicken pox. It was no big deal.