Allida, we do know that Abraham's family had been in the new world about 100 years before his birth, with the move to NJ initiated by one Richard Clark of Southold, Long Island. Richard was the Signers great grandfather.
As for one of the Signer's daughter-In-laws being a Margaret Alice Tarbok, the genealogical record simply does not support that. The daughter-in-laws of the Signers are: Susanna Winans, married to Aaron, Elizabeth Dixon married to Thomas and Lydia Griffith, married to Abraham.
You will find some interesting family background on Abraham's ancestors as well as a discussion of the son who was held by the British at
http://www.dsdi1776.com/signers-by-state/abraham-clark/ .
Jim Alexander
Registrar-General
DSDI