Yes, they are sisters.
yes, they are. They were on an episode of Bones together. I saw an interview with them from when they were filming it and they said they were sisters. Plus, they look pretty much exactly the same.
No, her sister Emily is older, born in 1976. Zooey was born in 1980.
Emily is vegan. Around April of 2010, Zooey declared she is no longer vegan.
No, she does not have any children.