They will look at the totality of your circumstances and determine if the beneficiary is likely to become a public charge. It will depend on your circumstances, and having a joint sponsor does not always resolve the issue. For example, if a petitioner is temporarily "in between jobs" but has an otherwise consistent work history and a qualified joint sponsor, the visa is likely to be approved. Someone who has not worked for years, has no or very limited income and no assets/savings, may not be approved, even with a qualified joint sponsor. You will have to show that the financial needs of the beneficiary will be taken care of. There is no way to predict if you will be approved in your particular case; if you are able to work, that would definitely help your case once it reached the consulate.