There was a book published called"Keyser,kirth and kin"
it was about the Keyser family that came from USA,They and the Stevens as well as your families all seemed to travel together (Palitines)and are inter married
I have their children as Nial and Sheldon Rupert
Nial married Eliza Jane Stevens in 1866 and had 10 children
Sheldon married Elizabeth Ann Marie Goodchild