I think Tenis could be Denis I would agree with that. Here are some Liverpool records for this family:-
MarriageDate: 13 Oct 1828 St John, Liverpool, Lancs.
Denis Dempsey - Labourer, Liverpool
Elizabeth Reece - (X), Spinster, same parish
Witness: Mary Price, (X); William Holden
Married by Banns by: Thomas Stringer, Curate
Births/BaptismsJohn Dempsey
27 Jun 1829
25 Oct 1829
St Anthony's RC Liverpool
Dennis Dempsey
Elizabeth Reece
Mary Dempsey
12 Feb 1831
6 Mar 1831
St Anthony's RC Liverpool
Dennis Dempsey
Elizabeth Reece
Joseph Dempsey
13 Jan 1833
20 Jan 1833
St Mary's RC Liverpool
Denis Dempsey
Elizabeth Dempsey
Helen Dempsey
19 Oct 1834
16 Nov 1834
St Mary's RC Liverpool
Denis Dempsey
Elizabeth Dempsey
Name: William Demsey
25 Sep 1836
9 Oct 1836
St Anthony's RC Liverpool
Dennis Demsey
Elizabeth Rice
Thomas Dempsey
12 Aug 1838
16 Sep 1838
St Anthony's RC Liverpool
Dennis Dempsey
Elizabeth Rees
BurialsName: Elizabeth Dempsey
Abode: Liverpool Workhouse
Age: 40
Burial Date: 26 Apr 1839
Cemetery: St Mary’s Cemetery, Cambridge Street, Liverpool
Name: Dennis Dempsey
Abode: Liverpool Workhouse
Age: 44
Burial Date: 26 Apr 1839
Cemetery: St Mary’s Cemetery, Cambridge Street, Liverpool
Name: Thomas Dempsey
Abode: Liverpool Workhouse
Age: 10 Months
Burial Date: 8 May 1839
Cemetery: St Mary’s Cemetery, Cambridge Street, Liverpool
Name: Ellen Dempsey
Abode: Liverpool Workhouse
Age: 4
Burial Date: 21 Jun 1839
Cemetery: St Mary’s Cemetery, Cambridge Street, Liverpool
Name: William Dempsey
Abode: Liverpool Workhouse
Age: 3
Burial Date: 11 Sep 1839
Cemetery: St Mary’s Cemetery, Cambridge Street, Liverpool
St Mary’s Cemetery is a different St Mary's to the St Mary's RC church. This St Mary’s was the Church of England’s parish cemetery. The probable reason for catholics often being recorded as Papists or Romanists was the requirement of different funeral practices for catholics. After this cemetery was closed it was landscaped and remained a green space for many years. The land now has buildings on it. Here is a map showing Liverpool Workhouse and St Mary's Cemetery in the 1840s:-
http://maps.nls.uk/view/102344096#zoom=6&lat=2029&lon=7073&layers=BTBlue