This is from an IRCC tweet when someone asked a similar question:Have a question on fees. My father already went for biometric while applying visitor visa and it's valid till 2029. Do I still need to pay the biometric fees while paying the processing fees?
You’ll need to give your biometrics and pay the fee each time you apply for permanent residence, even if you gave your biometrics in the past for another application.
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I have a screenshot but I can’t find the link. Quick google search for IRCC’s twitter feed can give you the answer. No twitter account necessary. So yes, we need to include biometrics fees too. My parents have given theirs recently as well but we need to include the fees again. Maybe they might refund it later?