"Ties of Blood and Water" is an episode of the syndicated American science fiction television series Star Trek: Deep Space Nine, the nineteenth episode of the fifth season.

Set in the 24th century, the series follows the adventures on Deep Space Nine, a space station located near a stable wormhole between the Alpha and Gamma quadrants of the Milky Way Galaxy. In this episode, Major Kira (Nana Visitor) must deal with her feelings over the impending death of her friend Tekeny Ghemor (Lawrence Pressman) as she takes notes from him as he reveals secrets about the Cardassian Union and the Dominion.

In an interview with Star Trek Monthly in 1997, actor Lawrence Pressman (who played Ghemor) likened the character to real-world examples of World War II German military officers who were unwilling to fight for Adolf Hitler and actually tried to assassinate him.

This episode marks the second appearance of Weyoun, played by Jeffrey Combs. Although his character was killed in "To The Death", the producers were impressed by Weyoun and established that the Vorta were clones in this episode.

Two years earlier, Major Kira (Nana Visitor) had been abducted and told she was the long-lost daughter of a Cardassian Legate named Tekeny Ghemor (Lawrence Pressman), disguised as a Bajoran for a top-secret mission. Although Kira never truly believed it, Ghemor did, and as he attempted to reestablish a bond between them, Kira developed a sympathy for him. When the truth came out and Ghemor realized she was not really his daughter, he told Kira he cared for her anyway.

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