1.  LDS.  Family Search: Internet Genealogy Service:  IGI - International Genealogical Index (online at FamilySearch.org):

Thomas CUPP or COOP Birth: 10 Jan 1830, Loyalsock, Lycoming, Pennsylvania; Death: 20 Oct 1899 Father: Thomas CUPP or COOP; Mother: Elizabeth REIGHARD Marriage: 17 Jul 1853, of Pennsylvania Spouse: Margaret EDER or EIDER Birth: 10 Apr 1831, of Pennsylvania; Death: 25 Feb 1908 Source: patron submission

Jane Elizabeth CUPP or COOP; Birth: 25 May 1854, Pennsylvania John Porter CUPP or COOP; Birth: 25 Mar 1856, Pennsylvania Lucy Ann CUPP or COOP; Birth: 11 May 1858, Lycoming, Pennsylvania Susan Emma CUPP or COOP; Birth: 1860, Lycoming, Pennsylvania Samuel Thomas CUPP; Birth: 22 Jul 1863, Williamsport, Lycoming, Pennsylvania; Death: Aug 1925 Catherine A. CUPP or COOP; Birth: About 1866, Of, Lycoming, Pennsylvania Sallie L. CUPP or COOP; Birth: About 1865, Lycoming, Pennsylvania Henry CUPP or COOP; Birth: About 1866, Pennsylvania Father: Thomas CUPP or COOP; Mother: Margaret EDER or EIDER Source: patron submission

2.  1850 Census Index/Images (online at Ancestry.com; Image #12 of 38):  Loyalsock Twp., Lycoming Co., PA, Roll 795, p. 314B/622, 78/__, enumerated 17 Sep 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):¤•

Thos Cupp

21

M

Carpenter

Pa

Living with the family of Jacob WEAVER, carpenter.

3.  1860 Census Indes/Images (online at Genealogy.com; Image #47 of 53):  Williamsport P.O., Loyalsock Twp., Lycoming Co., PA, Roll 1136 (Book 1), p. 421, PN 305, 2191/2253, enumerated 23 Aug 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):¤•

Thos Cupp	31	M		Farmer		600	Pa
Margaret	29	F					"
Jane E	6	F					"
John P	4	M					"
Lucy A	2	F					"
Susan E	4/12	F					"
Eliz Cupp	66	F					"
A S Bennett	12	M					"

Elizabeth (REICHERT) CUPP is Thomas's mother (there was a 3-yr-old A.A. BENNETT living with Elizabeth in the 1850 census). 

4.  1870 Census Index/Images (online at Genealogy.com, Image #7 of 48):  Williamsport P.O., Loyalsock Twp., Lycoming Co., PA, Roll 1370 (Book 1), p. 180A, PN 7, 53/53, enumerated 20 Jun 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):¤•

Cupp Thos	40	M	W	Farmer		500	Penna
____ Margaret	39	F	W	Keep'g House	2000		Penna
____ Jane E	16	F	W				Penna
____ John P	15	M	W				Penna
____ Lucy A	11	F	W				Penna
____ Susie	10	F	W				Penna
____ Saml	7	M	W				Penna
____ Sallie	5	F	W				Penna
____ Henry	4	M	W				Penna

Margaret's father died in 1865, and it appears Margaret has come in to her inheritance, which must have been substantial for Margaret to have received a sum this large, especially considering the sums inherited by her brothers.  Listed next to Margaret's brother, James EDER (? 49, b. PA, $5000, wife Sarah), who is next to Margaret's brother, John EDER (? 35, b. PA, $4000, wife Sarah).

5.  LDS.  Family Search: Census Records: 1880 United States (online at FamilySearch.org):¤•

Census Place: Loyalsock, Lycoming, Pennsylvania
Source: FHL Film #1255152; NARA Film #T9-1152; Pg 209A
	Relation	Sex	Marr	Race	Age	Birthplace	Occupation	Fa	Mo
Thos. CUPP	Self	M	M	W	55	PA	Farmer	GER	GER
Margaret CUPP	Wife	F	M	W	55	PA	Keeps House	PA	PA
Saul. CUPP	Son	M	S	W	18	PA	Works On Farm	PA	PA
Sallie CUPP	Dau	F	S	W	16	PA	At Home	PA	PA
Henry CUPP	Son	M	S	W	12	PA	On Farm	PA	PA
Katie CUPP	Dau	F	S	W	10	PA	At Home	PA	PA

Thomas's father may have been born in Germany, but his mother was born in Pennsylvania.  "Saul." has to be a misreading of "Saml."

6.  1890 Census:  the 1890 Census Population Schedules were destroyed.

7.  1900 Census Index/Images (online at Genealogy.com):  Thomas is deceased; Margaret is said to be still living, but I couldn't find her, and I checked all CUP/CUPP/CAP/CAPP/COP/COPP households in Lycoming Co., PA.

8.  WorldConnect / Ancestry World Trees (online at RootsWeb.com/Ancestry.com).

9.  Messages in the Cupp Family Genealogy Forum (online at GenForum.com).