I was very tired while I was watching this, so I kept dozing out even though I was really interested in the case. My annoying questions (feel free to ignore):
How were the grandparents related to the children? I thought the woman of the older couple was referred to as Charles's sister several times, so this wasn't making sense to me. Wouldn't that make her an aunt rather than a grandmother?
Did anyone say what happened to the five children that Chad had with the wife they apparently killed? Presumably they're with some other relative, but he seems as happy to be rid of his kids as she is to be rid of hers.
I missed how Alex, the brother, died. Also under suspicious circumstances?
Where do these people get the money to support their nice houses and their lengthy Hawaii hotel stays? Hawaii is pretty expensive, and I don't think there was a mention of what Chad's "business" was--not sure how he keeps a business running anyway, with this situation ongoing.
I agree that it's nuts that they just get to ignore questions about the whereabouts of the kids with no apparent legal consequences.
My sleep-fogged theory is that neither of her kids were perfect enough to bolster her self-image as goddess of the Second Coming, so she disposed of them. The whole story is nuts, even with my limited grasp of it.