How do you begin?

[Standfast]

Helping you along a bit - i forgot to mention the CWGC - Commonwealth War Graves commission
www.cwgc.org - so i looked for you.
You can eliminate these two who appear on the MIC's - both killed in action. Pasted from the seach results page.

2 record(s) match your search criteria
         
Name Rank Service Number Date of Death Age Regiment / Service Service Country Grave /
Memorial Reference Cemetery / Memorial Name
TWEEDIE, R Serjeant 200473 03/12/1917  Highland Light Infantry United Kingdom H. 53. RAMLEH WAR CEMETERY
TWEEDIE, ROBERT Private 8806 25/04/1915 34 Seaforth Highlanders United Kingdom Panel 38. YPRES (MENIN GATE) MEMORIAL

[JAKnighton]

Here's an update. I just received a copy of the Birth Certificate of one of his sons, who was born in 1918. It says that Robert Tweedie was a gunner in the Royal Field Artillery. This would be, I assume, the 35th Brigade which was the Glasgow Division.

I need to ask my grandfather if he was one of the 'Bantams', that is, men who were under the regulation height of 5 feet 3 inches! His son, my great grandfather was six feet tall as is my grandfather so that would be surprising. I'm thinking he may be one of the recruits from after 1916 when that wasn't allowed anymore.

[ev]

Was his service number on the certificate ?

Robert Tweedie , Royal Field Artillery , Regiment no. 652213 , rank Gunner.(Medal Card)

ev

[JAKnighton]

No number. Seems likely that's him though.