I suggest you use the IRS Interactive Tax Assistant - Do I Need to File a Tax Return?
This will walk you through your specific situation and give you an answer.
If you only get ssi or SS or SSDI it is not taxable and you do not have to file a return. And there is no benefit in claiming dependents or deductions. Unless you have federal income taxes withheld from the benefits or you get health care insurance through one of the state marketplace exchanges and receive a Form 1095-A then you need to file a tax return.