In those days, Baha'is were secretive

In those days, Baha'is were secretive and none would dare declare his faith openly, which was only reasonable and out of necessity. If a father was a believer, he would conceal it from his sons, and if a son was a believer, he would not dare admit it to any of his family, or for that matter, to other people. Baha'is would pray behind closed doors. The only family in which every member had become Baha'i, was the family of Jinab-i-Mirza Ibrahim Khayyat (the tailor).

(Crown of Glory, Aziz'u'llah Azizi)