Gladden Knapp - Fact or Fiction?

I am looking for any information on Gladden Knapp (b. 1696?), supposed son of Aaron Knapp Jr. (b. 1645, d. 1724/6).I have read several items which purport that Gladden is fictious, created to save Jabez's (Gladden's son?) reputation.I would like to correspond with anyone who is interested in this subject.

Thanks,

Brian Williams