I know this has been covered a million times. I am just inept to forum search engines.

Firstly, I get SSDI. JUst curious what the difference is between SSDI and SSD is?

Secondly, I get SSI. My SSDI is only $300 a month. SSI is another $300 a month. For a family of 12!!! Is it true, since I get SSI, I really do not get SSDI? It is considered just SSI? Say for example, I moved abroad. Will I still get the $300 SSDI? Or is that voided, because I get SSI?

Many more questions to come, and much feedback to add. Thank you dearly if you can be compassionate and helpful.