Did you check the income requirements? Sounds like you have family size of you + spouse + child + 2 parents + 1 dependent = 6 people. This will require you and your husband's combined Canadian income of:
2017 $76,015
2016 $75,174
2015 $73,733
Or maybe more sisters under age 21? Your original post is not clear. If so family size and income required would be higher.