The Finger's inLambertville, Huntingdon Co. NJ in 1880 are the family of Samuel A. Finger (25, Dry Goods Merchant, born NJ) and his wife Mary W. (daughter of Wesley and Hannah Hunt), and the family of W. Frank Finger (323, Dry Goods Merchant, born PA)and his wife Adelene S.
In 1870 in Milford Township, Pike Co., PA (page 420A, family #148, indexed under Fenger on Ancestry.com) I find Finger Elizabeth 45 F W$13000 $1000 PA "W. Frank22 M W Merchant Dry GoodsPA "Sarah18 F WNJ "Samuel15 M WNJ Which is the family you were looking for.
In 1860 they are still in Milford Township, Pike Co., PA (page 896, family #148): William Finger 34 M Miller $3500 $2000 Pennsyvania Elizabeth35 FNew Jersey William13 MPennsylvania Emma9 FNew Jersey Sarah7 F" Samuel3 M" John Thomas28 MAustria
This is followed by the family of Jacob Finger (36), a blacksmith, probably a brother.
In 1850 they are in Delaware Township, Pike Co., PA (page 69B, family #23, indexed under Tinger on Ancestry.com): William Finger25 M Miller Pa Elizabeth25 F" William F2 M" Mary E1 F"