'Sister Wives' Star Janelle Brown's Son Garrison Dead at 25, Apparent Suicide

Janelle Brown's son, Garrison, has died ... and it appears his death is a suicide, TMZ has learned. The "Sister Wives" star -- who's appeared alongside his mother and father, Kody Brown, on the hit TLC series over the years -- passed away Tuesday in Flagstaff, AZ ... where he had his own home after having moved away from his family. Flagstaff PD tells us ... officers responded to Garrison's home Tuesday morning…