The first person in this line of the Sen family to use the name Sōshitsu was the youngest son of Sen Sōtan.
The first person in this line of the Sen family to use the name Sōshitsu was the youngest son of Sen Sōtan; in other words, a great-grandson of Sen Rikyū.
The san-Senke derive from Sen Rikyū, and it was not until after the era of his grandson, Sen Sōtan, that the three separate lines of the family came into being.
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