The Sister Wives In remembrance, Savanah Brown states that Brother Garrison

Never underestimate "how big of a hole" their loss will create, Savanah urged her fans.

Savanah Brown of Sister Wives is thinking back on her brother Garrison Brown.

"My elder brother Garrison took his own life on Tuesday, March 5, two weeks ago," she said at the beginning of her first social media post after his passing.

It's difficult for me to grasp. But most everything, I know today that my brother Garrison is no longer in agony," Savannah concluded in an emotional Monday Instagram tribute.

She included a few pictures of her late brother in the message; the first was a photograph of him as a youngster, sitting in a chair and holding her while grinning broadly.

"I wonder for a moment if it's him driving home from work every time I see a car that looks like his before I am reminded that he is no longer with us," Savanah said.

She said that she also thinks about her brother when she stares up at the night sky and when she cooks peanut butter and jelly sandwiches.

She then made an appeal to everyone who may be thinking the same things her elder brother was.

"I really hope that whoever reads this doesn't realize how much of a hole their loss would leave," the author added. "Strive to succeed for the benefit of your loved ones, your family, and your friends."

Savanah included the National Suicide Prevention Lifeline's phone number at the conclusion of her message in case anybody was in need of it.

On March 5, Garrison's brother, Gabriel, 22, made the discovery of the deceased 25-year-old, as reported to PEOPLE at the time by Lieutenant Charles M. Hernandez II of the Flagstaff Police Department.

Using social media, his parents Janelle, 54, and Kody Brown verified the news as well, referring to him as “a bright spot in the lives of all who knew him.”

Madison, Hunter, and Logan are Garrison's other biological siblings.

Using a Jamie Anderson quotation, Maddie revealed her feelings about sadness last week. She said, "It's all the love you want to give but cannot."

Maddie released a new video for her followers on Monday, emphasizing the value of mental wellness.

"Mental health is so important, and I don't think we talk about it enough," she said in part. Furthermore, I believe we don't do enough to raise awareness. Bullying wasn't the situation. Garrison's mental health was the issue, not a lack of affection. And until I am blue in the face, I will not stop talking about mental health and self-care."

Along with their kids, Kody's previous spouses Meri, Christine, and Robyn Brown make up their family as well.