My dad came on March 19, 2019 on visitor visa for 5 months and he visited us for 2.5 months in 2016 (that's when he did his biometrics). and as per GCMS notes, CO exempted biometrics for my dad.
this is what's mentioned in GCMS notes.
BIOMETRICS
IRCC #
ASSESSMENT: Exempt - Pub Pol (In-Canada)...