Trace Cyrus, the son of country musician Billy Ray Cyrus, continues to hint at family discord even as his father appears to be happily in the throes of a new relationship.

On Tuesday, Trace Cyrus shared an Instagram post in which he accused the two-time Grammy winner of skipping his maternal grandmother’s funeral.

“This man is so hungry for fame it’s pathetic,” he wrote alongside a photo of Billy Ray Cyrus. “He really flew to Italy for a fashion show but wouldn’t come to LA for Mammie’s funeral while he was still married to my mom. Even after his daughter got him a 60k private jet like he demanded then he still didn’t come after the plane was paid for.”

Addressing his dad directly, Trace Cyrus added: “You’re the lamest man to ever walk the planet earth. Honestly embarrassed to ever have considered you my idol. The best thing to come from your downfall is it made me go into beast mode. I refuse to be a washed up, delusional, evil person when I’m old like you.”

A representative for Billy Ray Cyrus declined comment on Trace Cyrus’ remarks.