Contact the Social Security Administration for an accurate answer but I am pretty sure that you can only receive the higher of any benefits that you may be eligible for..  Examples:  If you are eligible to recieve disability on yourself for $300 per month. but your also would qualify for SSI Benefits at $600 per month.  I think you can draw $300 off yourself+ receive the difference from SSI to equal what the SSI benefits would be ($300 disability+$300 SSI to total the 600 SSI would be).  Yet at the same time if you were also eligible to draw of your X-spouse for $900 per month.  I think you would only be approved to draw the higher of the options.