Gypsies function in accordance with what is established in the so-called "gypsy law". Although it is mandatory, it is not a written code, but is merely oral and is dictated by the patriarch or group of patriarchs of the family group, that is, the elderly. You have all the information in: «What are the main customs of the gypsies?«.
You have all the information in: "What are the main customs of the gypsies?".