I need some help, I have a 9yo child with ADHD, ODD, some OCD, Tracheomalacia, Vocal cord dysfunction (VCD) and GERD. I have an attorney and am fighting for SS-whatever. I have been doing some internet research about SSI, SSDI, and SSD. I have a couple questions, first off what is the difference between the 3, does it have to do with age? Also I have read about a "dedicated account" which is fine, I think it's cool how the gov't tries to protect a minors money. I also read I was free to use the monthly benefits for his needs, (, school stuff, rent) but not the back pay, isn't back pay money he would have gotten monthly but didn't, shouldn't I have a choice on how that money should be used?