As Lynda says, Ruth, Elizabeth and Jane are all sisters. Here are the relevant records to show the relationships:
Ruth Fallowfield's marriage to George Dent:
"England Marriages, 1538–1973 ," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NLD4-J4K : 10 February 2018), George Dent and Ruth Fallowfield, 28 May 1865; citing Morland,Westmorland,England, reference , index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 0962101 IT 4, 97401, 97402, 97403.
Ruth Fallowfield's baptism:
"England Births and Christenings, 1538-1975," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NR9K-2HL : 11 February 2018, Ruth Fallowfield, 16 Jan 1831); citing , index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 97,401, 97,402, 97,403.
Baptism of Elizabeth Fallowfield, Ruth's sister:
"England Births and Christenings, 1538-1975," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NR9K-VW5 : 11 February 2018, Elizabeth Fallowfield, 12 Jul 1829); citing , index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 97,401, 97,402, 97,403.
Elizabeth's marriage to William Kilner:
"England Marriages, 1538–1973 ," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NLD4-B2P : 10 February 2018), William Kilner and Elizabeth Fallowfield, 12 May 1855; citing Morland,Westmorland,England, reference , index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 0962101 IT 4, 97401, 97402, 97403.
Just to confirm that Thomas and his wife Jane are the parents of Ruth, Elizabeth and the "sister-in-law" Jane that appears in the 1871 census, here is that Jane's baptism too:
"England Births and Christenings, 1538-1975," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NR9K-H22 : 11 February 2018, Jane Fallowfield, 10 Aug 1834); citing , index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 97,401, 97,402, 97,403.