<human>: Can you condense the text into three sentences or less?

We have been trying to figure out what caused a member of my family's mental retardation - we thought Fragile X, but according to a specialist, if he doesn't have enlarged testicles, then it's not Fragile X. The specialist is testing for XXY/Kleinfelter's syndrome, but that wouldn't explain the fact that this family member has a maternal uncle who seems to have the same condition.

Because this guy is on disability and can't really live on his own (he's reasonably high functioning, but he's over 40 and starting to have trouble - anxiety, arthritis, heart problems, etc.) he's on state medical care, which is only available if he drives an hour to see a primary care doctor, or 4+ hours for any specific test. 

The state won't pay for any genetic testing (the test for Fragile X alone is $1700) as he's 40 and it's not likely to change anything, but we're concerned about the possibility of passing these genes on, as well as looking for a way to get him on disability - if we know what the problem is, it's a lot easier to make the case that he can't live on his own - "anxiety" and mental retardation don't cut it, apparently. There are other family  members that have severe anxiety problems, muscular control issues, neurological symptoms, etc. but it's not easy to connect the dots without definitive testing - everyone has a few "quirks", after all.  

I've been trying to figure out what information 23AndMe gives you, and I've been looking through genome sequencing options, but I'm lost. I have some bioinformatics training, and friends who are quite capable of running sequence alignments, etc. against reference genomes. 

What's the best way to proceed here? Is there a DIY way to sequence a genome? Is there a no-bullshit company that will give me the sequences? I need this to be as cheap as possible, as my family will have to pay out of pocket.
<bot>: What's the best way to get a genome sequence to figure out the cause of a family member's mental retardation?