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In page Joseph Johnson (Virginia politician):

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The sixteen year old Johnson soon got a job helping Ephraim Smith, a local gentleman farmer suffering from ill health, came to manage Smith's land. Three years later, on May 14, 1804, he married one of his employer's daughters, Sarah Smith (1784-1853). At least five of their children died before age 11.[3] However, their son Dr. Benjamin Franklin Johnson (1816-1855) and daughter Catherine Selina Minor (1824-1900) survived and married, although both moved from the area (to Franklin County Ohio and Baltimore, respectively).[4]