I exactly agree the babies could have died if not found early on. But I don't think any of the family members are in danger, whether or not they are trying to get the kids. If Reader thought any of the family under his jurisdiction were in danger, he would let them know. And if somebody is in danger, and Reader knows it, then he knows who that person is and should be watching them like a hawk, hoping they'll slip up and he can put them in jail and have some peace of mind that there won't be another murder.