Hi William . . .
Welcome to Ireland Reaching Out . . .
As you are probably aware . . . Records . . stretching back that far . . are not there . . .
I searches the Land Tax rolls . . ." Tithes Applotment (1823 - 1837 ) " . . . nothing . . .
I did find the family . . . in " Griffiths Valuations " (1847 - 1864) . . . (see below)
For Offaly . . there are NO Census records . . . prior to 1901 . . .
In 1901 (see below)
http://www.census.nationalarchives.ie/pages/1901/King_s_Co_/Lusmagh/Gortarevan/1460660/
Record of the Death of Michael Glynn in 1881 . . . (see below )
I will put out a query to a family . . . who live in the area . . . BUT . . that far back . . will . . most unlikely . . .
Cheers . . Eamonn.