Watch Ozzy Osbourne's granddaughters rock out to 'Crazy Train'

Ozzy’s son, Jack, took to Instagram over the weekend to share a video of his daughters - Andy, 3, Pearl, 6, and Minnie, 13 months – performing ‘Crazy Train’ for their Papa, Ozzy.

With Pearl singing along to Ozzy’s 1980 classic, it’s three-year-old Andy who arguably steals the show by headbanging in the background as Minnie looks on from her highchair.

Jack captioned the video: “These girls are hilarious. #crazytrain #papa”

https://www.instagram.com/p/BvDLnwWhAFL/

Speaking about the clip on US chat show The Talk, Sharon Osbourne said they performed it especially for Ozzy who is still on the road to recovery after being hospitalised with pneumonia last month.

"Did you see the way Andy sneaks in? She starts the headbanging," Sharon said. "They did that to make their papa feel better."

We look forward to their rendition of ‘N.I.B.’ next week.

Last week Sharon and Jack Osbourne gave an update on Ozzy’s health, with Jack telling entertainment news show Access: "Well, if this gauges where he's at, he's complaining a lot and he's back to his normal routine. So everything's A-okay there."

Sharon joked: "That's always a good sign, when he complains and he's miserable. Then you know it's good."

Jack added: "It's when he's happy and skipping around. You're, like, 'There's something really wrong here. Call the doctor.'"

Agreeing, Sharon continued: “Really dark thoughts in his head, he’s happy, what’s going on?!”

Following the death of his former guitarist Bernie Tormé on Sunday, Ozzy paid tribute, writing: "What a sad day. We’ve lost another great musician. Bernie was a gentle soul with a heart of gold. He will be dearly missed. I send my sincere condolences to his family, friends and fans. Rest in Peace Bernie."

Ozzy had previously credited Bernie with saving his career after he stepped in for Randy Rhoads in the wake of the guitarist’s tragic death in a plane accident in 1982.