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Your brothers' applications should not have anything to do with your previous history with Canada.
I don't know what your parents stated but you were on a study permit and you haven't been back since you finished studying in Canada and now you want to come back for a visit.
Yes this has to be done again.
It may be best for them to apply together for their student visas.
Then you apply separately for your tourist visa.
You are very welcome.
I am glad you like to come back for visits! That speaks well of your time here.