Making my zooper available to 2 children with an...

Question

My son is 2yrs. I have a baby due in 5weeks. I was wondering if the zooper had an attachment like most other stollers do, to allow my son to still ride the zooper with the baby. I won't buy a double stroller. I have called zooper and I have not received a call back when I was told to leave a message that they would call back.