A.L.
Consider this, why would the principal of a very busy school, who has to take time out of her busy schedule want to go to court and LIE about a child, what gain is that... I think you have to consider something, as a school, if they have low attendance, they may be required by their school district to explain why. Moreover, as a former foster kid, I tend to be VERY suspicious of parents whose child is out a lot. Not because I don't believe the child is sick (afterall, my own son had childhood Asthma) but..... a child with such severe Asthma, seems to me that as a parent, if I couldn't reach the principal, I'd have driven up to the school and made an appointment IN person, this way there is no miscommunication..
Also, you don't know for sure that the principal was unavailable for his parents, that is hearsay. Personally, something doesn't seem right here, kids aren't turned over to the state just like that, the state has to be very careful what it does because it knows it can be sued, as can the school. Somewhere in all this, I wonder IF the child's parents are telling you everything... you'd be surprise what my foster mother/father got away with under the radar.. on the outside, it looked all nice, but at home... ugly and very dark things were taking place..
IF the court felt this child needing protecting, I do think there must be a reason. things aren't always what they seem.
what you can do now is just be supportive to your nephew...