People are dying to get one of these private sponsorship spots. If your husband is unwilling to come to Canada you will have to become the primary applicant. You should probably contact a refugee organization that has more experience with these applications or IRCC number to find out what your options are and how you need to proceed. Don’t think your husband can be listed as non-accompanying on a private sponsorship and after your claim your husband will likely not be able to get a tourist visa to enter Canada. It is pretty uncommon to get this far and have a group of 5 and then the main applicant no longer wants to come to Canada. If anything the whole family decides not to come to Canada.