From Church records of StJames Parish in Anne Arundel Co MD, it appears that Seth Hyatt was the oldest son of Charles Hyatt. The following comes from "The Hyatt Genealogy" 12 Dec 1718 Seth Hyatt obtained a deed to a tract of land called Maiden's Fancy in Prince George County MD. 1726 he inherited from his father, Charles Hyatt, his plantation called Tewksbury. For the fol. record of the deses. of Seth and Wm. (sons of Chs.) I am indebted very largely to Mrs. Della Hyatt of Annisquam, Mass., 1st family genealogist widow of Prof. Alpheus Hyatt of Harvard University. She furnished practically all of the data concerning Wm. Hyatt and his deses, and much of Seth and his line. Being of the later line myself, and of Hyattstown Montg. Co., a settlement of Seth's deses., I have been able from Fam. statements, Fam. Bibles, gravestones and otherwise to supplement Mrs. Hyatt's data (sometimes referred to as Prof. Alpheus Hyatt's Fam. Records").Mrs. Hyatt spent yrs. in her investigations, and wrote: the information concerinign the early founders of Hyattstown and Hyattsville I think is accurate. There is no doubt that Seth was the ancestor of the Hyatts of Montg. Co. The data concerning Meshach Hatt's deses. has been gathered from wide correspondence with aged people in Va., Ohio, Kan., Ill. and Neb. The descs. of Wm. Hyatt and Eliz. Walker , being in my Hsband's line, I believe is pretty accurate. All my attempts to get back of Chs. have been fruitless." She corresponded with English vicars and received much data of ther Hyets of Painwick and the Hyets of Sydney, whos pedigree and arms were recorded at the Heralds Visitation of 1623 and again in 1634; secured a mass of data from the Parish registers at Barbadoes; spent much time investigating the records of the Quacker Hiatts of NC, Ind., and Kan. (all of whom had the belief that they originally came form Md.) but nowhere did she find connection with Chs. A Thomas Hyatt asiled for Va. 1.2.1634, aged 23, in the ship Bonaventure from London, and Md.. wills and other records shwo there were Hyatts in Md. before Chs., but for the present at least Chs. himself must remain the immigrant ancestor the fam. here given. Seth Hyatt of P.G. Co., Md., eld. son of Chs. and Sarah. was b... 9.20.1694, prob. in A.A. Co., as his birth is recorded in the St. Jas. Par. register of that Co. About 1717 he married Alice _____ and on Dec. 12, 1718 obtained a deed to a trict of land called "Maiden's Fancy" in P.G. Co. In 1726 he inherited from his father "Tewksbury". one hald of whic before his death c. 1750, he sold to his bro. Wm. Hyatt and the other half to Benj. Buvall (1711-1803), whose da. Martha later m. Wm. Hyatt, Jr. Seth Hyatt, Sr. was living Dec. 10-1718, when old Fred. Co. was erected out of the old P.G. Co. restricting the latter to it present limits. The dividing line ran "from the lower side of the mouth of Rock Creek by a straight line joining the east side of Seth Hyatt's plantation to the Patuxent river" (Kilty's Laws his Hyatt line begins with the arrival of of Md., v.1 ch. 15; Md. records, v. 1 p. 91). This threw the home place "Tewksbury" into Fred. (now Montg.) Co. Seth, Sr. d. shortly after this erection of Old Fred. Co. as Shadrach Hyatt as Admr. of his fa. Seth rendered his account 2-25-1750-1.From Qn. Anne's Par. register and "Accounts of Administrators" in the office of the Register of Wills at Annap., the chn. Of Seth and Alice were: (1) Seth, Jr.: (2) Shadrach: (3) Meshach: (4) Avarilla (m. n. Prather), no record; (5) Abednego: (6) A da. who m. Neale Clarke, o record. Seth Hyatt, Jr. (Seth, Chr) b. 10-5-1718 (Qn. Anne 305). In 1758 he purchased "land wiht premises" from Benj. Welsh of P.G. Co. In. 1766 he was admr. of his bro. Shadrach and confirmed by deeds the sale of half of Tewksbury to his uncle Wm. Hyatt (the consideration having been paid to his fa. "Seth Hyatt deceased"), and the sale of the other half to Benj. Duvall ( the consideration having been paid to his bro. "Shadrach deceased," while the latter was admr. of his fa. Seth Sr.) Seth Jr. seems to have d. (prob. unm.) before completeing his adm. of his bro. Shadrach's est., as in 1769 Hezekiah Spier had ecome "Admr. of Shadrach Hyatt, deceased."