I've picked up on a few things that have been mentioned where a little bit of detail might be helpful:
It was stated somewhere that they moved to Hawaii to open a juice stand. Does anyone know the name of it? I've been trying to research in the business registration and sales tax license databases here without success. Knowing when they applied for and surrendered those licenses will pin down the dates for the Hawaii move. Unfortunately one cannot search by principal name here. I can search by agent name but that turned up nothing. There is no reason they would need to form a business but they would need a tax license for virtually any business and a health permit for a juice stand.
Tylee mentions in a post somewhere that her favorite drink from "Real Fruit" is strawberry banana. I take that as a clue that "Real Fruit" might be the name of the juice stand business but it is so generic as to not be helpful when searching.
There is another entire avenue that I am trying to explore and coming up empty and this could be very relevant in terms of explaining motives and pinning down dates. Charles Vallow had/has a linked in page. It is easy to find so I am not linking it here. But his picture is on it so it is definitely his. On there we find out he was in the annuities/insurance business in several states including some not mentioned elsewhere yet. That generally requires a state license yet I have not found a current or past license for him in any of those states or nationally. Could be because he is dead but I doubt it. One of those states is Hawaii and I know for a fact that dead people are not purged here.
The linkedin page also states he is managing partner or owner of a couple of businesses. Digging into those brought up a few more business names that he is associated with and each one has a disabled website. That's not terribly unusual if he is dead. I was able to Wayback them but the results were uninteresting.
I think other people have posted Princeville addresses for the family but Tylee went to school in Kapa'a. According to the link below, that makes sense because Kapa'a HS (and MS) serve the entire North Shore of Kauai where Princeville is located. See link below.
Kauai School Districts - Which Side of the Island is Right For Your Child? - Hawaii Real Estate Market & Trends | Hawaii Life
Finally, the speculation about cyanide poisoning being the cause for a couple of our victims is questionable to me. There is a distinct odor associated with cyanide poisoning that all first responders are (or should be) trained to look for. And cyanide poisoning is treatable if caught soon enough. So it would not be the ideal choice for someone looking for a death to appear to be from natural causes.