there is mention www.manxnotebook.com/history/military/ms_1850.htm
think John age 45 in 1841 census is ? born Bradford 1795:03:08 pars John + Grace SUGDEN (igi bat J107655 + m. 17900111 igi M107655) d. Ger 18650118 age 70 (there is John Sheard born Ovendon, Yorkshire served 34th Foot Regiment, 77th Foot Regiment, discharged age 41 in 1835) wife Sarah Sarah GREENOP/GREENOFF/GREENOTT/ GREENHAW/GREEVES /GREENHOPE (take your pick !) - this family lived in Beach Street;
I believe John's father was JOHN SHEARD serv 1794-1816
Born BRADFORD, Yorkshire
Served in 11th Royal Veteran Battalion; 5th Royal Veteran Battalion; 3rd Dragoons
Discharged aged 45 in 1816 - m. Elizabeth Corkill Ger 18111226 - this was his 2nd wife they lived in Strand st

Note the 11RV was stationed in Peel at end of Napoleonic wars (they are the ones who did more damage to St Patrick's Isle than 100yrs of neglect !)

His son appears to have parked his wife and kids with his parents whilst serving in Army.