Los Angeles, California - Pop star Miley Cyrus' brother Trace posted an emotional open letter on Instagram voicing concerns about their father Billy Ray's current health and well-being.

Just a few days after Billy Ray performed at Donald Trump's inauguration, Trace Cyrus posted a heartfelt open letter on Instagram.

"Since my earliest memories all I can remember is being obsessed with you and thinking you were the coolest person ever," the 35-year-old musician shared, reflecting on his admiration for his father along with a nostalgic photo of the pair.

He continued, "Sadly the man that I wanted so desperately to be just like I barely recognize now."

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Trace expressed sadness over how distant their father has become, saying he, Miley, and their younger sister Noah have all been worried for years.

"Me and the girls have been genuinely worried about you for years but you've pushed all of us away," he stated.

He also called attention to Billy Ray's notable absence from Noah's life in particular, writing, "That's your baby girl. She deserves better."

Trace addressed their father directly, writing, "You're not healthy Dad & everyone is noticing it."

He also reflected on his own accomplishment of celebrating over a year and a half of sobriety.

"Guess what? I feel amazing," he wrote, urging his dad to come to him if he needs help.

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"Till that day comes I will continue to pray for you," he concluded the post.

While Trace's post mentioned Miley and Noah, neither have publicly commented on the situation, according to Rolling Stone.