Scotland coach Matt Williams has opted to draf in the 22-year-old in place of Simon Webster.
The introduction of Lamont is the only change to the Scotland side which defeated Italy at Murrayfield two weeks ago.
The duo will be the 45th set of brothers to play international rugby for Scotland and the 19th set of brothers to have played together in the same Scotland team.
The Scotland team to play Wales in the RBS 6 Nations Championship on Sunday 13 March:
C Paterson (Edinburgh Rugby); R Lamont (Glasgow Rugby), A Craig (Glasgow Rugby), H Southwell (Edinburgh Rugby), S Lamont (Glasgow Rugby); D Parks (Glasgow Rugby), C Cusiter (The Borders)
T Smith (Northampton Saints), G Bulloch (Glasgow Rugby), G Kerr (Leeds Tykes), S Grimes (Newcastle Falcons), S Murray (Edinburgh Rugby), S Taylor (Edinburgh Rugby), A Hogg (Edinburgh Rugby), J Petrie (Glasgow Rugby)
Substitutes: R Russell (London Irish), B Douglas (The Borders), N Hines (Edinburgh Rugby), J Dunbar (Leeds Tykes), M Blair (Edinburgh Rugby), G Ross (Leeds Tykes), A Henderson (Glasgow Rugby).
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