I have just uploaded to WorldConnect this 5th generation (Robert, John, William, John) son. William and Susanna's descendents that I have been able to find from two of their sons, Mordecai (b.1832) and William C. (b .1836).
Please note that there are no children named Elizabeth, Kate or Levis for this couple as reported elsewhere on the internet. These three offspring had parents of John and Sarah in the same area at the same time.