1a.  1880 United States Census and National Index (LDS Family History Resource File: CD-ROM Library):

Census Place: Chanceford, York, Pennsylvania
Source: FHL Film 1255208; NARA Film T9-1208; Pg 618B
	Relation	Sex	Marr	Race	Age	Birthplace	Occupation	Fa	Mo
Benjamin ELLIAS	Self	M	M	W	55	PA	Farmer	PA	PA
Margaret ELLIAS	Wife	F	M	W	51	PA	Keeping House	PA	PA
David ELLIAS	Son	M	S	W	23	PA	Laborer	PA	PA
Benjamin ELLIAS	Son	M	S	W	18	PA	Laborer	PA	PA
Adam ELLIAS	Son	M	S	W	11	PA	At Home	PA	PA
Isaac ELLIAS	Son	M	S	W	8	PA	At Home	PA	PA
Franica ELLIAS	Dau	F	S	W	15	PA		PA	PA
Ida M. ELLIAS	Dau	F	S	W	6	PA		PA	PA
John ELLIAS	Brother	M	S	W	72	PA	Laborer	PA	PA
Adams CUPP	FatherL	M	W	W	81	PA	Laborer	PA	PA

Adam is apparently Margaret's father.

1b.  1880 Census Images (online at Ancestry.com; Image #12 of 31):  in checking the image of the above record, it's "Adam," not "Adams," and Margaret's age could just as easily be 37 as 51, in which case, Benjamin would have had an earlier wife.  There are numerous ELLIAS'es enumerated nearby.