Ok, I heard now Canada issue 10 years multiple visa to family members,,, can I apply for Family sponsorship for my mother and brother and then apply for 10 years multiple visa for my mother (and brother) so that she can visit Canada(for max of 6 months) until she gets her immigration visa?
In case of my brother can he study in canada with 10 years multiple Visa? (i know he has to exit and re-enter into canada before his stay exceeds more than 6 months)
Yes - your mother and brother can certainly try to apply for a 10 year visit visa. For the visas to be approved, they should show they have strong ties to their home country (property, assets, family, business, school, etc.) and plan to return once their visit to Canada is over.
No - your brother cannot study in Canada on a visitor visa. He needs a study permit.
Note that a multi year visit visa is intended to be used for visits only. If someone is starting to spend more time in Canada than outside of Canada on a multi-year visit visa (i.e. if it looks like they are essentially living in Canada), they can be refused entry at the border.