I'm running out the door and I'm sure more informed people will pipe in, but just to put your mind at ease on a Saturday morning....
Yeah, the numbers are wrong. 130 does NOT = 99.9%. The ceiling is NOT 140 (although it's also my understanding that when you get into that neighborhood things become iffy, 130 isn't really that neighborhood).
If she was giving you these numbers over the phone, maybe she just misspoke or you misheard. Maybe she said 140 or 150. Call her back. I think the ceiling is 160 and I DON'T think 140 is quite 99.9%, so maybe she meant to say he scored 150 and the ceiling is 160.
You have A LOT of relevant data - your observations on your three kids, your parents' observations of your brother, the observations of 3 preschool teachers. I think it's very likely that 130 is either not correct or not representative of your son's abilities.
Finally, my kids have been tested a lot because we applied to different programs with different requirements and because scores for some of the programs needed to be more current that what we had. So with 2 sets of 3 tests, this is what the scores were (in no particular order:
135, 139, 148, 140, 140, 121
Obviously one doesn't belong. It happens. BTW - neither of my boys presents as advanced as what you are describing.
