I chased down the townhomes.
Per the MSM interview with the neighbor, Lori was in #175 (it is shown when they show JJ's toys on the porch). Here is the listing from when she rented it (listing removed/rented 8/27/19):
https://www.zillow.com/homes/565-Pioneer-Rd-Apt-175-Rexburg,-ID,-83440_rb/2088542432_zpid/
And here is a separate listing for the same unit when it went up for rent again on 12/30/19 (I don't know if she broke the lease or if she had negotiated for a semester-long lease since she was "going to school"):
https://www.zillow.com/homedetails/565-Pioneer-Rd-UNIT-175-Rexburg-ID-83440/234170351_zpid/
Then, Lori's "sister" (aka niece, Melani) rented the unit next door. The listing was removed/rented 10/25/19, not that long after MB texted BB that she was "moving to Boise." This unit is owned by the same landlord and managed by the same property management company as #175. Also, remember this is just speculation, but she is living there with her new spouse and AFAIK he has his kids there part time. So I hesitate to put the exact unit # out there, but obviously it is one of two, and it is the one that was rented in October. Find the listing for yourself if you want to. I hope it goes without saying to respect people's privacy. They are not POI, and we don't know their level of cooperation with the LE.
Alex rented in another building, but I don't know for sure if it was this one (listing removed/rented 8/27/19, re-listed 11/26/19):
https://www.zillow.com/homes/565-Pioneer-Rd-.num.-182-Rexburg,-ID,-83440_rb/242783578_zpid/
or this one (listing removed/rented 8/28/2019, re-listed 12/2/2019):
https://www.zillow.com/homes/565-Pioneer-Rd-.num.-107-Rexburg,-ID,-83440_rb/234170324_zpid/
What we don't know is if maybe LV and AC's real sister helped them move to Rexburg? Or if it was Melani all along, but she went back and forth a bit, maybe was mostly in Arizona in between helping Alex and Lori move in early September, and moving into her own place in late October. And the neighbor just assumed. It does make me worry a bit about what else the neighbor has said that we have taken as fact.
I do think it's interesting that if MB was in Rexburg in September for at least some amount of time, but then was in Arizona on 10/2, as was Tylee's jeep, MB's travel timeline and route may be identical to, or very similar to, that of the kids. Did they all caravan down to Arizona together around 8/24/19? If Tylee and JJ never made it to AZ or Melani saw them arrive in Arizona but never saw them again, she would have to be wondering where they were!
Either she was told a very believable lie by Lori, or she knew where the kids really were (at least for the first while). Otherwise, wouldn't she sound an alarm if the children of her neighbor/aunt were suddenly gone? Best case scenario for Melani is that Lori *didn't* tell her where the kids were/what happened to them, but simply said "The kids are going to be elsewhere, and for your own good and theirs [if Lori was playing up the custody angle], I'm not telling you anything more about it." Thus saving her from having to lie when/if questioned.