your mother will need a visitor visa if not from a visa exempt country.
You need a custodian, that is a responsible adult in Canada to look after your interests if under 17 and is the applicants responsibility to identify the person who will perform this task, usually a trusted friend of family or relative residing in Canada. From 17 to the age of majority it is the visa officers discretion whether a custodian would be required. Age of majority varies by province between 18/19. http://www.cic.gc.ca/english/study/study-minors.asp
thanks. ya my mother wants to come along with me with a visitor visa because i am 17. i am sory i am still confused. will i need a custodian if my mother travels with me on a visitor visa and stays with me until i am 18?