Collection of my findings this morning:
Essex Antiquarian 6 (1902):46 (citing probate records)
Arthur Auger, who lived at Scarborough, York Co., Me., or Blackpoint, died of wounds, inflicted by the Indians, at Marblehead, Oct. 14, 1675. His wife Ann and children survived him. He had a brother, Giles Roberts, who was then deceased.
This suggests that either Giles had a sister (Ann) who married Arthur Auger OR that Giles had a wife with maiden name Augur. If the former, that starts building a Roberts family...
Marilyn Fitzpatrick, "Descendants of Godfrey Sheldon, Part I," in The Essex Genealogist, 26 (2006):118 [answers the above question unless Giles had more than one wife]
Godfrey Sheldon and Alice Frost [had six children starting in early 1623; the last, a daughter, is listed as:]
vi. (--?--) [Sheldon] m. Giles Roberts
[AH... BUT... This daughter had a sister Anne Sheldon who m. Arthur Alger. This writer is claiming that the "brother" relationship is through Arthur's wife's sister...]
heh heh... there's so much discrepancy out there... how's a girl to know?
"The Alger Family of Maine," in NEHGR, 29(1875):271 says something else entirely:
Arthur Alger... married Ann, daughter of Giles Roberts [not daughter of Godfrey Sheldon as above], who survived him. Having no children, he brought up three of the sons of his brother(!)-in-law Giles Roberts [son of his father in law?], and at his death left them L5.10 a-piece.
Here's another claim that Ann was daughter of Giles Roberts: "Descendants of Samuel Walker," in NEHGR 57(1903):352
Ann Walker, the above, was his [Samuel Walker's] second wife. She was the widow of Arthur Alger of Scarborough, and daughter of Giles Roberts, also of that place. She died in Woburn, Mar. 21, 1716.
A footnote for the above says "For confirmation see REGISTER, vol 29, pp 270-272 [see previous quote]; Middlesex Co. Deeds, 26:488-489.
The American Genealogist, 70(1995)63 does a review of a book that came out the previous year: Descendants of Giles Roberts of Scarborough, Maine, by Joann H. Nichols (Baltimore: Gateway Press, 1994), cloth, viii +210 pp., endpaper maps, index, $35 postpaid. Order from author (with address in Brattleboro, VT)
BUT note the title is the Descendants of Giles not his ancestors.
The review admits that little has been previously researched about this man.
Okay, sorry, Vic, nothing further on him from NEHGS.