When going through Monzo to Payments->Transfer Internationally and selecting “CAD” as the currency, Monzo/Wise asks for (using the “Local bank account” option):
Recipient type: (Person/Business)
Full name of the account holder
Institution number
Transit number
Account number
Account type: (Checking/Saving)
There is also the option to pay by “Interac” (instead of Local bank account) which asks for:
Recipient type: (Person/Business)
Full name of the account holder
Interac registered email
Hopefully these terms mean more to you then they do to me and you will be able to send your brother the details needed.