I read that his wife is an MIT graduate and daughter of a Bacardi executive. Here's a bio:
Vilma Espin Guillois
Vilma Espin Guillois is an industrial chemistry engineer who is married to Raul Castro, head of the Cuban Armed Forces and brother to Cuban President Fidel Castro. She has been President of the Federation of Cuban Women since its foundation in 1960. The organization is an ECOSOC-recognized NGO with membership of more than three and a half million women.
A member of the Council of State of the Republic of Cuba, Vilma Espin headed the Cuban Delegation to the First Latin American Congress on Women and Children in Chile in September 1959. The mother of four and grandmother of seven is a member of the Central Committee and the Political Bureau of the communist Party of Cuba. She headed the Cuban delegation to the Conferences on Women held in Mexico, Copenhagen, Nairobi and Beijing.
http://www.summit-americas.org/Women/biographies.htm~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
His daughter, Mariela Castro, who a sexologist, is pushing to legalize the change of identity for transsexuals and provide sex-change operations by the state. She has helped foster greater tolerance for transvestites and gays in Cuba.
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Havana.– Mariela Castro is leading a Cuban revolution less well known than her Uncle Fidel's: one in favor of sexual tolerance within the island's macho society.
Castro, 43, is leading the charge from her government-funded National Center for Sex Education, based in an old Havana mansion.
As director of the group, she promoted a soap opera that scandalized many Cubans in March by sympathetically depicting bisexuality. The controversial show depicted, among other story lines, the life of a construction worker who leaves his wife and children for the man next door.
Now President Castro's niece is pushing for passage of a law that would give transsexuals free sex change operations and hormonal therapy in addition to granting them new identification documents with their changed gender.
A bill was presented to parliament last year and was well received, she said. It is expected to come up for a vote in December.
If approved, it would make Cuba the most liberal nation in Latin America on gender issues.http://www.dominicantoday.com/app/article.aspx?id=15272 Mariela Castro is leading the charge from her government-funded National Centre for Sex Education, based in an old Havana mansion. Reuters