Fusilier Lee Hilmer-Hills, 18, and his brother Lance Corporal Alex Hilmer-Hills, 22, from Pembrokeshire are currently based in the town of Tapa with the 1st Battalion The Royal Welsh.
They have been stationed in the Baltic country as part of the Nato's Enhanced Forward Presence which has seen more than 800 UK troops deployed to Estonia to deter potential aggression from the Kremlin.
The British Army is providing the bulk of the numbers through the armoured infantry task force of the 1st Battalion The Royal Welsh.
With temperatures regularly below freezing, the pair have recently undertaken Exercise Winter Camp - spending nine full days and nights in the snowy Estonian forest.
Fus Hilmer-Hills said he has not seen much of his brother during Exercise Winter Camp due to being in different platoons, and revealed how their parents do not mind them being deployed at the same time.
LCpl Hilmer-Hills has been in the Army for four years and when asked what their parents think of their joint tour, he said they are "proud", before joking that "they're glad we are not at home".
He said he is proud of his younger brother.