The question is who married Mary Griffith, sister of Thomas Griffith and what, if any, relationship did they continue have to Thomas Griffith and Elizabeth Ward, that might give us more information about Elizabeth Ward? The same goes for Edward Helle/Hagel.

Will of Tho. Griffith. Bequests wife Lucey Griffith 1000 acres on the Susquehannah River (450 acres on the north side of Mount Ararat and 550 acres on the south side “Alveys”. Edward Helle [could be Hagel] his choice of 3 islands. Elizabeth Ward, sister. Mary Saward [Seward] & 2 oldest sons; Henry Haslewood. Date: 20 April 1665. Witnesses: Lewis Stockett, Rich. Loes. Will proved on 25 June 1666 by Lewis Stockett.

One site I found notes that Thomas Seward, husband of Lucretia Griffin, was the son of William Seward and Mary Griffith. If that is the case, and this still needs to be verified, Mary was probably Mary Griffith, sister of Thomas Griffith. I need more information about William Seward and his wife Mary. Mary's sister was Elizabeth (Griffith) Ward. Who was she married to? Was she the Elizabeth who married William Ward (1646-1720) or was she married to Henry Ward (1638-1683)?

There are a substantial number of Sewards that descend from William Seward of colonial Surry County/Isle of Wight County, VA. There is some evidence that the Sewards in these two counties were part of the same family. The Isle of Wight branch came from John Seward, a merchant of Bristol, England. In spite of the efforts of many to connect the Virginia Sewards with those in the northeast, there is currently no evidence for any connection.

The Virginia Sewards produced a substantial number of descendants, who migrated to South Carolina, Tennessee, Arkansas, and Kentucky. At least one Seward female migrated with her husband to Ohio, although almost all of the Ohio Sewards seem to be from Obadiah's line. In addition, there are at least two other lines that I know of. One was in Maryland.  

http://genforum.genealogy.com/cgi-bin/pageload.cgi?colonial,maryland::seward::190.html

THOMAS SEWARD 

Seward, according to some well-researched sites, came to America in 1667 when he inherited a 300 acre plantation, "Tidings," from his uncle, William Bishop.  Not much is known of his first wife, Elizabeth.  He was over 40 when he married Lucretia, also known as Lucy, and, given her subsequent marriages and the number of children she had, she was younger than he. 

He married (2) LUCRETIA GRIFFIN^2,3 Abt. 1680 in Maryland³. She was born Abt. 1662 in Maryland. 

Notes for THOMAS SEWARD:

MD Arch. 16:100 Thomas secured two tracts of land in 1687--"Sewards Hope", 300 acres in Kent Co. on 20 May 1686, and "Molden", 283 acres on 7 Jul 1686 in Kent Co. Also in 1686, the Kent Co. Court appointed him constable for Eastern Neck area of the same Co. In Maryland Calender of Wills page 29 list- Will of Thomas Seward, Kent Co., dated 28th Oct.1687, recorded 19th Apr.,1688 To wife Lucy, extx., plantation (unnamed) absolutely. " son Thomas at 16 yrs.of age, 300 A., "Spread Eagle." " Charles, son of Thomas Hinson, and hrs., 150 A., part of " Sewards's Hope." " Thomas, son of Nicholas Merly, 150 A., part of sd. " Seward,s Hope." Test: Edw. Richardson, Eliza: Pearle. 4. 319. \\

Children of THOMAS SEWARD and LUCRETIA GRIFFIN are: 

 The county levy approved October 30, 1677 allowed 600 pounds of tobacco to John Darby for keeping Court at his house. (Kent County Court Proceedings, Liber I, p. 32.) The next year 700 pounds of tobacco was allowed Thomas Seward for the same service, and in this same levy, passed December 10,1678, 15,000 pounds of tobacco is made available "Toward the building the Courtt house" (Op. cit., p. 65).

1688  - Edward Richardson, Kent Co. MD witnessed deed for Thomas Seward.

Henry Green of Talbot County married by July 3, 1701, Lucy, widow of Thomas Seward and Griffin Jones, who died by August 10, 1702; Lucy Green recorded the births of several children of Thomas and Lucy Seaward and of Griffith and Lucy Jones. (KELR GL#1:7, 35) Maryland Marriage Evidences, 1634-1718 By Robert W. Barnes

Nicholas CLOUD and Thomas SEWARD administered the estate of Hugh JOHNSON, guardian of George REID whose mother, Joan BEALE of Calvert County was godmother of an Elizabeth COMBS.

 Thomas Seaward Sr. willed "Tippings Plantation" by his cousin, William Bishop on 9 May 1685. William Bishop calls Thomas Seaward his "cousin" in his will.

Michael & Thomas, sons of Thomas Seaward Sr. willed "Bishopsfield" & "Dangerfield" by Wm. Bishop-9 May 1685.

Michael not mentioned in Fathers Will (Thomas) will was wrote 28 Oct 1687.

This writer speculates that Thomas Seaward had two daughters who married Thomas Hynson and Nicholas Merly. Thomas Sr. left large tracts of land (Sewards Hope) to the son's of these men, one was named Thomas. The families remained close after Thomas Seaward Sr.'s death. This writer believes that Thomas was probably married to someone before Lucy and fathered two daughters he was in Maryland for 17 years before we find him having children with Lucy who was probably much younger than him based on her future childbearing......Thomas Merly must have died young because Lucy gave his tract of land to her daughter Mary Jones in 1702.

Will of Thomas Seaward 1

In the name of God Amen the twentieth eight day of October 1687 according to the computation of the Church of England I, Thomas Seward of Maryland in the county of Kent being of perfect memory and remembrance praised be God doe make and ordain this my last Will and testament in manner and forme following. First I bequeath my soul into the hands of Almighty God my maker hoping that through the Merritts, death and passion of Jesus Christ my only savior and redeemer to receive free pardon and forgiveness for all my sins and for my body to be buried in Christian buriall at the discretion of my Executrice hereafter nominated. Item: I give and bequeath unto my well beloved wife Lucy Seward the Plantation that she liveth upon, she and her heirs forever and do make and ordain to be my whole and sole Executrice. My Will is that...... Item: I give and bequeath onto my sonne Thomas Seward the plantation wich Thomas Hynson now liveth upon being three hundred acres called by the name of the Spread Eagle. Item: I give and bequeath unto Charles Hynson sonn of Thomas Hynson one hundred and fifty acres of land lying at the head of Morgans Creeke going by the name of Sewards Hope to him and his heires forever. Item: I give and bequeath unto Thomas Merly sonne of Nicholas Merly one hundred and fifty acres of land belonging to the same tract of Charles Hynson him and his heires forever, and for the rest of my personal estate for to be divided betwict my wife Lucy Seward and my sonne Thomas Seward and doe make my sonne att age att sixteene yeares. If any of those legatees should dye without issue then the said land is to be returned to my well beloved wife Lucy Seward or her heires. Thomas Smith and Josias Lannam to be my executrix assisting and my sonns trusty as wittness my hand and seale this day of yeare above written. Signed Sealed and delivered in the presence of us: William___________, Edward Richardson, Elizabeth Pearle. His marke, Thomas (TS) Seward. Sealed.

On the back of the will was endorsed as followith...Aprill the 19th day 1688....Then came before me the evidence of the within Will and tooke oath upon the Holy Evangelist that this was the last will and testament of Thomas Seward late deceased as wittness my hand the day and year above written...Jonathan Hynson........As alsoe the appraisers Josias Lanham and Thomas Smith being sworn the yeare of day above written. Jno. Hynson.......Evidence Will Cramp, Edw. Richardson.

Maryland Probate Records, 1674-1774, Calendar of Wills, Vol 2, 1685-1702, p 29 

Abstract of the Will of Thomas Seward, Kent County, Maryland.

Dated: 28 Oct 1687; Probate 19 Apr 1688

To wife Lucy, extx, plantation (unnamed) absolutely.

To son Thomas at 16 yrs of age, 300 A, "Spread Eagle."

To Charles, son of Thomas Hinson, and hrs, 150 A, part of "Seward's Hope"

To Thomas, son of Nicholas Merly, 150 A, part of sd "Seward's Hope."

Test:  Edw. Richardson, Eliza; Pearle

Husband: Thomas Seward

Born: about 1640 in England

Married: about 1680 in Kent County, Maryland

Died: 19 APR 1688 in Kent County, Maryland

Father: William Seward

Mother: Mary Griffith

Spouses: ?

Wife: Lucretia Griffin

Born: about 1650

Died: before 1724

Father: Anthony Griffin

Mother: Jane ?

Spouses: Griffith Jones; Henry Green

01  (M): Michael Soward

Born: about 1682

Died: about 1687

Spouses:

02  (M): Thomas Soward

Born: 30 NOV 1684 in Kent County, Maryland

Died: 1761 in Queen Anne's County, Maryland

Spouses: Susannah Tipford; Rebecca ?

(181) John Seaward [i], 300 acres in the county of Warrosquoiacke, beginning at a small creek towards the head of Warrosquoiocke river. Due for the transportation of 6 persons (whose names appear below.) Granted by West, July ist, 1635.

Henry Weblin, Thomas Woodcock, Wm. Thompson, Arthur Scott, Jon. Brinton, Edward Peeters.

Note.

[i] John Seward was Burgess for Isle of Wight, 1645. l° l665. Mr. John Seward patented 1,500 acres called "New Hemington," on Sea- ward's Creek, in Isle of Wight county, which was formerly granted to his father, John Seaward, in 1649.

(182) William Ramshaw, 200 acres in Elizabeth City county, at the mouth of Elizabeth river. Due 50 acres for his own personal adventure; 50 for the personal adventure of his wife, Katherine Ramshaw, and 200 for the transportation of two persons, John Stephens and Thos. Panford. Granted by West, July ist, 1635.

(183) John Seaward, too acres in the county of Warrosquoiacke, being part of an island called Ragged Island. Due for the transportation of two persons, Katherine Perry and Henry King. Granted by West, July ist, 1635.