Well from what I know! If you spouse has a permanent residence here in Canada, and he/she wishes to have some of his/her family come visit. They'll have to apply for a visitor's visa. Which I will tell you right now; unless they have a lot of financial, business, and family ties to the Dominican Republic they will deny the visitors visa. The Canadian Embassy is horrible for issuing out visitor visas for Dominicans. As a matter of fact I don't know anyone that has applied for a visitor?s visa ever been approved. Their reason for denial is always the same. "They?ll denied him/her because they felt that he/she would not return home?
Good Luck,
Personally I would consider sponsoring them if they wish to live in Canada, or you'll both have to fly down too visit them.