Well, I'm not in the area, so I won't be of much help. However, I have seen some cases such as this where the removal of the child was warranted, I'm afraid.
For that reason, I don't rush to judgment without further information. You say you have not met the boy...just the father through your church. That's inadequate, IMO, for forming a clear assessment of the situation. Not everyone in any church, or any other group, is a reliable source, I've found.
There's simply not enough information to draw any conclusions.
FAS can often produce a "child without a conscience". My bet is that this kid is sheer evil--abusing his siblings, destroying property, etc. That Carry_Okie hasn't met this kid because the parents can't bring him to church is quite telling. I have heard of caregivers who would never otherwise hurt a fly resort to chaining FAS kids to bed every night so they can get some sleep; they can be that violent & destructive.
Knowing so little about the situation, I'm not passing judgment, but FAS children make me question my anti-encouraged-sterlization stance. 75-85%+ of all prisoners have FAS.