So far as I know I am not related.This particular Hills family is however a mystery.There is an entry for them in the Sweetser genealogy-1938 Seth Sweetzer & His Descendents 1938 by Philip E Sweetser published by Integrity Press of Philadelphia.
The entry for Robert Sweetser Hills states he was born Oct 20, 1920 in Milford, NH.
He is listed as the son of Bessie Marion Sweetser and Aubrey Flawith Hills who was b 16 Aug 1883, son of Robert Henry Hills and Rachel (Young) Hills.
His mother is listed as the daughter of Harrison Cole Sweetser and Abby Ann Walton.Information is given on places of birth, dates and deaths if needed.
From the Hills side, none of the written genealogies have any record of either Robert Henry and Rachel (Young) Hills or of Aubrey Flawith Hills and Bessie Marion Sweetser.Normally, one would assume that a Hills born in New Hampshire belongs to the Joseph Hills line of Malden, Mass the 1638 immigrant.But there seems to be some problem making that assumption here.