Do not let them have him ANYWHERE that you cant control! The kingdom hall is not the problem or the threat THEY are. The first time they tell that baby that mommy is going to be killed by God and birds are going to EAT her because she doesnt go to the Kingdom Hall...He is NEVER EVER going to forget that. So dont dont dont let them have that child.
They have already proven they cant be trusted not to try to inculcate the kid and are viewing him as a "fatherless child" needing their spiritual guidance because mommy isnt hacking it.
It only needs to happen once that you trust them and they screw this little ones head up. DONT DO IT.