what made you think so specifically the focus is Boyle area in Co Roscommon ?
http://
titheapplotmentbooks.nationalarchives.ie/search/tab/home.jsp
Mc Grath James Drumman More Kilglass Roscommon 1833
Mc Grath Edwd Drumman More Kilglass Roscommon 1833
Mc Grath John Drumman More Kilglass Roscommon 1833
Mc Grath James Lisbride Roscommon Roscommon 1824
Mcquin Mary Mullaghmacormick Kilglass Roscommon 1833
Mcqueeney Patrick Crumlin Dublin 1827 the only one in all ireland
Geography
Kilglass civil parish I didn’t find a map quickly so am guided by the catholic parish
Kilglass Catholic parish {13} is on the eastern boundary just north of the midline of the County.
The townland {19} Drumman More on the eastern boundary just north of the midline of Kilglass civilparish. see
http://www.leitrim-roscommon.com/MAPS/kilglass.html . The parish itself is line of the
Have you searched thoroughly
http://roscommon.rootsireland.ie1850s Griffiths valuation narrowing to killglass area see askaboutirelandwebsite
Mc Quinn Patrick Drumman More Kilglass Roscommon
Mc Grath John Drumman More Kilglass Roscommon
Mc Grath Patrick Drumman More Kilglass Roscommon
so could the remaining descendants be in in one of the homesteads in
the 1901 census,eg
21 in Drumman More (Kilglass North, Roscommon)
Mc Grath John 40 Male Head of Family Roman Catholic
Mc Grath Mary 40 Female Wife Roman Catholic
Mc Grath Ellen 14 Female Daughter R Catholic
Mc Grath Mary 13 Female Daughter R Catholic
Mc Grath John 6 Male Son R Catholic
or perhaps
2 in Fortlane (Boyle Urban, Roscommon) needing explanation
Johnston Mary 32 Female Head of Family Roman Catholic Boyle Pentioner Cannot read - Married -
Conlon Catherine 56 Female Mother Roman Catholic Boyle Pentioner Cannot read - Widow
Conlon Margaret 22 Female Sister Roman Catholic Boyle Pentioner Cannot read - Not Married
Mc Quinn M Anne 12 Female Daughter Roman Catholic Boyle Scholar Scholar
Mc Quinn Patrick 6 Male Son Roman Catholic Boyle No Scholar -
Lots of irish luck in finding your link