Pennsylvania Families

A tree at ancestry.com says she died Aug 2, 1902 and is buried in Rimersburg.

http://trees.ancestry.com/tree/43078993/person/12614031156

Is one of these Elizabeth Black's arrival in the US?

Elizabeth Black, spinster, age 17, born in Ireland, was living in Ireland. Left from Liverpool. Arrived 12 Sep 1881 on the Germanic
http://castlegarden.org/quick_search_detail.php?p_id=2097907

Elizabeth Black, spinster, age 20, born in Ireland, was living in Ireland. Left from Glasgow and Larne. Arrived 13 Feb 1882 on the State of Florida
http://castlegarden.org/quick_search_detail.php?p_id=2107651

1900 Census Rimersburg Borough, Toby Township, Clarion County, Pennsylvania
ED 28, sheet 1, dwelling 6, family 6

[I don't see Rimersburg named on the sheet, but the enumerator was Frank H Rimer.]
Done June 8, 1900.

 

Hamilton, James, Head, Mar 1863, 37, married 17 years, born in Scotland, parents also, coal miner
Elizabeth, wife, Dec 1866, 34, married 17 years, 8 children, 6 alive, born in Scotland, parents also, no occupation
Agnes, daughter, Apr 1883, 17, single, born in Missouri, no occupation
James, brother, Apr 1885, 15, single, born in Pennsylvania, farm labor
Maggie G, sister, Oct 1888, 11, single, born in Scotland, at school
Lizzie, sister, July 1894, 5, single, born in Pennsylvania
Jennie, sister, Apr 1897, 3, single, born in Texas
Joseph, brother, Feb 1900 3m, single, born in Pennsylvania

The information said James owned the house free of mortgage. It was a farm. Information is on Farm Schedule 1.
[Note: Ancestry.com says the farm schedule for 1900 was destroyed by order of Congress.]

Both James and Elizabeth arrrived in 1881 and had been here 20 years. James was an alien

Did the oldest daughter provide the information? Why is everyone called a brother and sister, not son and daughter?
Where is Archibald, born Oct 1888?

United States Census, 1900, index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M39L-JRD : accessed 07 Feb 2014), James Hamilton, Toby Township Rimersburg borough, Clarion, Pennsylvania, United States; citing sheet , family 6, NARA microfilm publication T623, FHL microfilm 1241395.

in Rimersburg on the 1900 Census

Living in Hamilton Co., MO, when daughter Agnes was born