Hello Rachel.......
I found military records for 2 Thomas Parkinson's one born 1868 and 1869.......
First name(s) Thomas
Last name Parkinson
Birth year 1868
Birth place as transcribed Sunderland
Birth place Sunderland
Link to site
discovery.nationalarchives.gov.uk/details/r/D8077935
Source Registry of Shipping and Seamen: Index of First World War Mercantile Marine Medals and the British War Medal
Archive reference BT 351/1/109236
Medal type Merchant Navy Medal Index Cards, 1914-1920
Record set Britain, Campaign, Gallantry & Long Service Medals & Awards
Category Military, armed forces & conflict
Subcategory Medal rolls and honours
Collections from Great Britain
and
First name(s) Thomas
Last name Parkinson
Birth year 1869
Birth parish Bury
Birth town Bury
Birth county Lancashire
Birth country England
Service number 1156
Regiment 3nd Battalion Royal Lancashire Regiment
Year 1886
Attestation date 04 Feb 1886
Attestation age years 17
Attestation age months 11
Attestation service number 1156
Attestation corps 3rd Battalion Rl Lancaster Regiment
Document type Attestation
Series Wo 96 - Militia Service Records 1806-1915
Archive The National Archives
Archive reference WO 96
Box 73
Box record number 367
Record set British Army Service Records
Category Military, armed forces & conflict
Subcategory Regimental & service records
Collections from Great Britain
I hope this helps.........
Mike