States: Delaware: Kent
I have never heard of such a boundary change - I beleive Mason adn Dixon (and possibly later surveyors, too) established the western boundary between Maryland and Delaware long before the 1800's. The exceptions would be Sussex County, which due to land disputes was considered part of Maryland at one time, and the "Wedge", a small area in northwest Delaware which wasn't resolved until the 1900's.
A possibility is that your ancestors lived close to the border - I have several ancestors from Kent and Queen Anne COunties who were a few stones' throws from the Delaware line and some of their properties straddled the boundary.
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