I've seen several documentaries of police interrogating the parents. Sometimes, the LE prefer to zero in on the parents first. There are different kinds of police interrogators. If it is in their hearts to lie, trick, manipulate these parents (or the other brothers), they can produce "suspicions." It seems to me that LE should put finding the baby alive, FIRST. If they never can find her, they can always go back in investigate the parents later. What I have seen in this case, they did not follow up on important leads that pointed to the baby being taken (the three witnesses who saw a man carrying a baby that early morning.) That should have been FIRST. They keep doing things that seem to "show" that they are investigating the parents. From what I have seen, I would be very afraid of LE if they seemed to zero in on me, because then they don't do all they can to find the baby. They fear having their boys frightened and threatened unless they say what LE wants to hear.