The size was what threw me back when I first saw it too, but, I got to thinkin on it some, and, I believe that the boys may have bought the home, for themselves, and their families, in Feb. 2014. The parent's names were not on the deed. It also appears that both brother's, I think, again, were unexpectedly, single men, either shortly before, or not long after, they purchased the home on Peterson.
When the two brothers relationships broke apart, that's when I think that GW3 and AW moved in, which would be at some point in 2015. GW3 gets custody of his child, and after they all realize they have no leverage against HMR, nor her family, in getting control of S., it seems the W family decided to just kill JW's "inlaws" and be done with it.
GW3 was married to his child's mother in Nov. 2012. GW3's child was born in 7/2013. By early 2016, GW's wife is gone, has remarried, and has a young baby. So, by sometime in 2015, she was out of GW'3 life.
S was born 11/2013. HMR and JW were to be married, according to her Twitter post on 8/26/2014, the next year on their five year anniversary, 8/27/2015, but by early 2015, JW and HMR have split.
I would like to hear an interview from GW3s ex.