The link you will find comes in with Dorothy Thomas where she marries William Caddy, you need to go back about 4 or 5 generations from the start of Sue's tree to find Dorothy. Sue's tree gives her own line descending on with Richard, he was one of William's brothers and this is where our interests tie in.
Dorothy and William had 9 Children:
William b 1737 Henry b 30/1/1738 / 1739? Dorothy b 18/10/1743 John b 13/1/1745 / 1746? Charity b 1/11/1748 Richard b 5/5/1751 James b 28/7/1753 Mary b 26/6/1757 Elizabeth b 8/2/1761
I also came across the following in my records that may be of interest to you. It refers to the arrangements that had to made by Richard H Caddy following the death of his father William Caddy in 1810. I have transcribed it for you from a photocopy of the original:
Know All Men by these presents that we Richard Caddy of the Parish of Wendron in the County of Cornwall, Tinners John Thomas of the parish of Mawgan in Meneage in the east County Yeoman and James Michell of the parish of St Keverne is the said County Yeoman are held and firmly bound unto the Worshipful William Short Clerk Archdeacon of Cornwall in the sum of Two Hundred Pounds of good and lawful money of Great Britain to be paid unto the said William Short or to his certain Attorneys his executor administrators or Assigns to which payment well and truly to be made we oblige ourselves and every of us by himself for the whole of our each and every of our heirs executors and administrators firmly by these presents sealed with our seals dated the eleventh day of June in the Fifitieth year of the reign of our sovereign Lord George the third by the Grace of God of the United Kingdom of Great Britain and Ireland King Defender of the Faith and in the Year of our Lord One Thousand Eight Hundred and ten. The condition of this obligation is such that if the above bounder Richard H Caddy being as the son admitted administrator of all and singular the goods chattles and credits of William Caddy late of the Parish of Wendron deceased do make or cause to be made a true and perfect inventory of all and singular the goods chattles and credits of the said deceased which have or shall come into the hands possession of knowledge of Him the said Richard Caddy or into the hands and possession of any person or persons for him and the same so made do exhibit or cause to be exhibited into the registry of the Archdeaconry Court of Cornwall at or before the last day of September next ensuing and the same goods chattles and credits and all other goods chattles and credits of the said deceased at the time of his death which at any time after shall come to the hands or his possession of the said Richard Caddy or into the hands and possession of any other person or persons for him do well and administer according to law and further do make or cause to be made a true and just accompt of his said administration at or before the last day of June 1811 and all the rest and residue of the said goods chattles and credits which shall befound remaining upon the said administration accompt the same being first examined and allowed of by the Judge or Judges for the time being of the said Court shall deliver and pay unto such person or persons respectively as the said judge or judges by his or her decree or sentence pursuant to the true intent and meaning of a later act of parliament made in the two and twentieth and three and twentieth years of the reign ofour late sovereign Lord King Charles the second intituled and act for the better settling of Intestates estates and shall limit and appointAnd if it shall hereafter appear that any last will and testament was made by the said deceased and the Executor therein named do exhibit the same into the said court making request to have it allowed and approved accordingly of the said Richard Caddy above the bounder being there unto required do render and deliver the said letters of administration approbation of such testament being first and made in the said court then this Obligation to be void or else to remain in force and Virtue