No record of Rebecca Parks/Parque's date of birth can be found, but she was reported to have died 1807 in Newberry County, South Carolina at the remarkable age of 99,  which would place her date of birth in about 1807/08. She was the daughter of French Huguenot immigrant, Jacques Parque; and one source has her born in France, not Ireland. 
On Dec 10, 1727 Rebecca and William landed in New Castle, Delaware in company with William's parents and other colonists, settling in Lancaster County, Pennsylvania.
Rebecca was married in Ireland at age 16 to John Walkup, aged 52, a match arranged by her father and the groom, and then widowed four months later. She married second in about 1724 in County Antrim, Ireland, to William Caldwell, the son of John Caldwell and Margaret Phillips.  But one researcher says they were married in Lunenberg Co., Virginia  (actually Brunswick Co., from which Lunenberg was formed in 1746), which would place the marriage in, or after 1739, and which could fit what we know of their eldest son John. More on this dilemma below.
Rebecca and William emigrated from Northern Ireland, landing in New Castle, Delaware on 10 Dec 1727 with the Caldwell family. They settled first in Lancaster County, Pennsylvania in a community of Scots-Irish Presbyterians, and then removed in 1739 to Charlotte County, Virginia where they established the Cub Creek Settlement.   
Roy and some other researches claim that William and Rebecca's first child John was born in 1728, but William's will dated 09 Jan 1758  clearly indicates that his eldest son John was not yet 21, which would place the date of John's birth in or after 1736, and this jives with John's DAR Ancestor record that shows his date of birth as 1740.  Rebecca names eight of their children and four of their grandchildren in her will dated 04 Oct 1799. 
Rebecca and William had joined his parents' settlement at Cub Creek, Virginia by 1742, when deeds prove that he owned land in the new settlement.
If we ignore unsourced dates, we come up with a list of William and Rebecca's known children, and their documented dates of birth and/or death:
John and Sarah predeceased their mother and are the only ones not mentioned in her will of 1761. Roy and others show a daughter Ann who married William Lesley,  but there is no mention of her in early accounts of William & Rebecca Caldwell, nor is there much "room" for Rebecca to have birthed more than 10 children between 1740 and 1760, when Rebecca turned 53. Similarly, there is no record of a Henry or a Jennet/Jannet born to William Caldwell and Rebecca Parks.
Another mystery arises from William & Rebecca's grandchildren mentioned in Rebecca Caldwell's will:
Rebecca was said to have been as staunch in patriotism and Presbyterianism as her husband; had sufficient education herself to teach all her children to read and write (the fact that she signed her will with "her mark" was probably due to her advanced age and failing vision). She is described as quiet, decorous and introspective, small of stature with brown eyes, high forehead and cheekbones and a smiling countenance.
By 1770, Rebecca's eldest son John, established in surveying South Carolina, persuaded her to join those of her children settled there, bringing the last of the young ones from home. In South Carolina she settled on Mill Creek, 16 miles due west of the present town of Newberry in the old Ninety-Six District. The site, translated to present geography, is believed to be near the joining of Mill and Mudlick creeks, and the junction of Routes 56 and 65 in western Newberry County. 
A staunch Whig, Rebecca welcomed to her home once in 1782 James Creswell, a young soldier of "proclaimed passionate animosity toward the British" whom he had just evaded. Rebecca's eldest son, John, had been murdered by an erstwhile Tory neighbor, "Bloody Bill" Cunningham the year before. Alerted that the Tories were arriving on Cresswell's trail, Rebecca, aged 75, sent her daughter Elizabeth into hiding and ordered some of the young woman's clothing for Creswell. In long skirts and large bonnet, Creswell with Rebecca mounted the ladies' riding horses as Rebecca informed the Tories that they must be on their way at once to a critically ill neighbor. The enemy set about searching for Creswell and finding Elizabeth realized they'd been duped. In retaliation they destroyed most furnishings, drove off the stock, and only by fast action of the slaves was the home saved from fire once the Tories left. 
According to memoirs of William and Rebecca's granddaughter, Elizabeth Ann (Caldwell) Higgins, five daughters waited until after the Revolution to marry, and then there was a gala mass wedding at the "home place" as Sarah, Margaret, Eleanor, Elizabeth, and Rebecca were all married there on the same day. 
Rebecca is buried in the Caldwell family cemetery in Newberry County, SC. 
Not named in Rebecca's will, except to ask that they all be sold upon her death.
Transcribed by Jouett Taylor Prisley, 1994
In the name of God Amen I Rebecka Caldwell of Ninety Six District of Newberry County being weak in body but Sound in Memory Blessed be God for his Mercies, I do this day Make and Publish this my Last will and Testament and I do hereby Revoke and Make void all former Wills by me Made, I do Recommend My Soul to God that first gave it and My Body to be Decently buryed, and as touching Such Worldly goods where with it has pleased God bless Me with I despose there of as follows, first to Discharge all My Lawful Debts Second I give and bequeath to my Daughter Elenor Moore one Cow and Calf Item I give to My Daughter Rebecha East one yallow bay Mare and one cow and calf also all My house hold furniture Except three Beds and furniture to be Equally divided between My four Daughters to wit Marget Richey, Elenor Moore, Rebecha East and Elizabeth Gillam, also I give and Bequeath to My grand Daughter Sarah Martin fifteen pounds Sterling I give to My grand Daughter Rebecha Graves one bed and furniture I give to My grand Daughter Rebecca Moore one bed and furniture also to My grand Daughter Rebecha Caldwell one bed and furniture I give and Bequeath to My Son James Caldwell all that Plantation or Tract of Land Whereon I Now live to him and his Heirs forever as also to the S James all My Stock of Sheep and My part of a Waggon and it is My will and desire that all My Slaves together with all the remainder of My Property as before Mentioned Should be Sold and Eaqually Divided between My Eight Children (viz) Marget Richey, Martha Calhoun, Elenor Moore, Rebecha East, William Caldwell, James Caldwell, Elizabeth Gillam, and David Caldwell and it is My will and desire that Should any of My Children die before Me that the part of Such Child or Children, ... and I do Constitute and appoint My two sons William Caldwell and James Caldwell My Lawful Executors to this My Last will and Testament in witness whereof I have to this Presents Set My hand and Seal this 4th day of October in the year of our Lord one thousand Seven Hundred and Ninety Nine and in the 23 year of the Independence of the United States of America.
Signed Sealed and Delivered
in the presence of
Recorded in Will Book "G" page 102 & 103, Proved June 2 - 1806, Recorded May 2 - 1817, Samuel Lindsey ;Ordinary of Newberry District, Box 27, Pkg 56, Est. No. 622'
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On 2 Jan 2017 at 18:04 GMT Fred Prisley wrote:
Rebecca is 14 degrees from Kevin Bacon, 24 degrees from Robynne Lozier, 12 degrees from Pocahontas Rolfe and 15 degrees from Queen Elizabeth II Windsor on our single family tree. Login to find your connection.