Newburyport and its sisters

Photo source: Maria Campanita

This beach is not located in Newburyport.

Golden Beach is within the city limits of Zelenogorsk, Newburyport's Russian sister along the Gulf of Finland.

Newburyport has a second sister in Bura, within the Taita-Taveta district of Kenya. The MassKenya.org site is down.

This makes me ask two questions:

1. I know Zelenogorsk residents have visited Newburyport; a book of their visit is chronicled in City Hall. I also know Newburyport residents have visited Bura; newspaper clippings of their visit are in the library's lobby. But have residents from both Zelenogorsk and Bura visited Newburyport at the same time?

2. As Newburyport is a sister to both, would both be sisters to each other?