1.  William S. Pelletreau, compiler.  1903.  Abstracts of Unrecorded Wills Prior to 1790 on File in the Surrogate's Office, City of New York.  Vol. XI.  Collections of the New York Historical Society for 1902. New York, NY (online at GenealogyLibrary.com).  Boldface added.

In the name of God, Amen. June 15, 1702, in the 14 year of King William III. I, JOSEPH FARRER, of New England, mariner, being sick.  All debts to be paid.  I leave to my mother, Anne Siers, of Lancaster, in New England, a sufficient maintenence for life.  And what is left after her death, I bequeath to my sister, Mary Houghton and her heirs.  Among things mentioned in the will are:  A chest containing 7 Pieces of 8, each value 6s., 9d., two small boxes, with a small gold ring with a stone in it, three pair gold buttons, three gold buckles, about a fathom length of gold wire of a fit thickness to make small hoop rings, a good Sea Quadrant, Sundry maratime books, two or three good raisors, a light fashionable Broad cloth suit, but little worse for wearing.  A pair of Breeches, with silver buttons, and about œ8 in gold in one of the Pockets.  I leave to my uncle, Samuel Dean, of Jamaica, on the Island of Nassau, 70 Pieces of 8, and I make him executor. Witnesses, William Digges, Judith Barton. (Not proved.)  [NOTE.--The "Piece of 8" was a Spanish Dollar. Its value in New York currency was 8 shillings, but in New England currency its value was 6 shillings or a little more.--W.S.P.]

Joseph could have an uncle surnamed DEAN only if his mother's maiden name was DEAN or if one of his father's sisters married a DEAN.  The second signatory to a deed or will is usually signing on behalf of the interests of the wife.

2.  LDS.  Family Search: Internet Genealogy Service: International Genealogical Index (IGI).

Joseph FARRER Birth: 6 Aug 1660, Lancaster, Worcester, Massachusetts Father: Jacob FARRER; Mother: Ann Source: Birth, Marriage, and Death Register, Church Records, and Epitaphs of Lancaster, Massachusetts, 1643-1850.  Henry Stedman Nourse, 1831-1903.

3.  LDS.  Family Search: Internet Genealogy Service: Ancestral File (AF) and International Genealogical Index (IGI).  The LDS IGI and AF are all over the map with regard to Mary.  She was born some time between 1648 and 1652 in Lancaster.  John HOUGHTON is styled Jr., III, IV, and/or Esq.  One source says Mary's parents are John & Joanna FARRER, but one of the only two primary sources we have show Joseph's parents were Jacob & Ann; and the other primary source clearly proves Anne (__?__) SIERS was his mother.