MY husband and i got married in Canada and i filed to sponsor him for PR. We just had?

an elopement married two witnesses not a wedding, we didn't have lots of wedding picture to send to cic just what we had. We have a 22 months old son together. The cic recently ask use for my husband medicals and our son's birthday certificate. Is there any way for them to call us for an interview. Is having a child not enough evidence that the marriage is real even though we didn't do a big wedding and didn't have family members during the marriage since both of our family members are out of the country and we just recently move to Calgary and have just two friends.