After listening to his rendition of Dean Lewis' Half a Man, the judges were taken aback by Moon's emotional performance.
"I could see through your singing, that's how you were getting through it," Meghan shared.
Meghan's brother, Ryan Trainor, shares a similar story with the contestant. After struggling with drug and alcohol abuse, the 30-year-old has since become sober.
Present during the filming process itself, Ryan came out to greet Moon with a hug.
Witnessing their compassionate embrace, Meghan was brought to tears over her brother's newfound connection. After his successful audition - which received three Yes' from Kyle, Amy and Meghan - Moon has secured his place in the Top 50.
WATCH: Meghan Trainor brought to tears over brother's connection with Australian Idol contestant. Article continues after video.
Ryan, who maintains a close relationship with his younger sister, has shared more of his story on their joint podcast, Workin' On It with Meghan Trainor and Ryan Trainor.
If this short interaction is anything to go by, the two are very much a tight duo.
If you or someone you know is struggling, help is available at:
Lifeline Australia: 13 11 14
Family Drug Support: 1300 368 186
Stimulant Treatment Line: Sydney metropolitan: (02) 9361 8088 / Regional and rural NSW: 1800 10 11 88
SANE Australia: 1800 18 7263