I would say lay low for sometime. Cancel their flight tickets and apply after some time. May be after 6 months to a year. Also in addition to how much your husband earns, it also matters how much you have in your bank accounts.
I recently did TRV for my parents and my in-laws. They are all retired. Also, I am the only son, so I had to make sure we show sufficient proof of ties for my parents. On a high level, these are the documents I submitted, and their Visas were approved in around 10 days time. They have all made their trips successfully and went back.
Their documents:
>Passport and other ID.
>Bank account statements
>Notarized current market evaluation for the properties they own.
>Return flight tickets.
>Itinerary of what they were going to do in Canada.
Our documents:
>Passport and other ID.
>Bank account statements and recent salary slips.
Thanks. How many months they stayed?
I forwarded almost the same. It just the property doesn’t know the market value and not notarized.