Sister Wives star Garrison Brown has died, leaving a hole in the lives of everyone who knew him. His mother, Janelle Brown, shared the news on social media. Garrison Brown was just 25 years old and one of six kids Janelle had with the family patriarch, Kody Brown. Sister Wives has aired on TLC since 2010.Kody Brown is a polygamist with four current or ex-wives and 18 children.Garrison was frequently on the show.Related: See Inside the Homes of Country Music Queens “Kody and I are deeply saddened to announce the loss of our beautiful boy Robert Garrison Brown,” Janelle Brown writes. “He was a b…