yes, you can do that. Because that's what we did. My husband's salary is low and what we did is..we both asked for NOC from our employers (each one of you will ask for NOC to sponsor your son), then bank statements, and accommodation contract. so it's like preparing requirement for each, but the application form is just your husband. He will still sponsor your child but with your documents, it will only show that both of you can be able to support your kid. Hope this will help. You can PM me if you need more details. Good luck.