From the Order of the Eastern Star web-site
http://www.easternstar.org/

"Who may join: Only men who are Masons are eligible and only women with specific Masonic affiliation may be members. These affiliations include:

* Affiliated Master Masons in good standing,
* the wives
* daughters
* legally adopted daughters
* mothers
* widows
* sisters
* half sisters
* granddaughters
* stepmothers
* stepdaughters
* stepsisters
* daughters-in-law
* grandmothers
* great granddaughters
* nieces
* great nieces
* mothers-in-law
* sisters-in-law

and daughters of sisters or brothers of affiliated Master Masons in good standing, or if deceased were in good standing at the time of their death; as well as members - either active for three(3) years or majority - of the International Order of the Rainbow for Girls or of the International Order of Job's daughters, each of whom having attained to at least the age of eighteen (18) years, are eligible to membership in the Order of the Eastern Star."