A Maricopa County Assessor search shows the 3818 E Gemini Pl house is owned by an LLC whose initials match the landlord for the 5500 block of S. Four Peaks Place property where Charles was shot. He talks about renting to Charles and Lori prior to their move to Hawaii in a FB posted by East Idaho News. Putting it all together, my guess is that the Gemini Pl home is where Charles and Lori lived prior to their move to Hawaii.
Article:
Court docs, body camera detail aftermath of shooting that killed Charles Vallow | East Idaho News
Link to image in article:
Link to Maricopa County Assessor, just type in the address:
Maricopa County Assessor's Office
Edit to add from your timeline:
End of 2014/Beginning of 2015 -Lori and Charles Vallow move to Hawaii with JJ and Tylee to start a juice bar called "Juice Island". This business was reportedly a failure and they would eventually move back to AZ (Note: Date based on business filing dates and social media posts; story about the juice bar was from insider posts on WS and confirmed by business filings).
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So if he rented to them for "about 5 years," that would put them in the Gemini home from around the end of 2009/beginning of 2010.