'Sister Wives' Star Garrison Brown's Last Texts Worried Janelle Before Suicide

Janelle Brown sent one of her sons to check on his brother before Garrison Brown took his own life this week -- and the reason she did that had to do with his final texts. According to the police report, obtained by TMZ, cops say they spoke with the "Sister Wives" star Tuesday upon word that Garrison had shot himself ... and they describe what Janelle says were troubling messages Garrison had been sending to some…