United Kingdom, Oct. 3 -- Jack Osbourne felt heartbroken when his parents Ozzy and Sharon Osbourne moved back to their native UK.

The couple lived in the US for decades, but wanted to spend their twilight years back home at their mansion in Buckinghamshire even though it meant being apart from their son Jack, who remained in the States with his four daughters - Pearl, Andy, Minnie and Maple - and he feared the girls would only get to see their grandparents "once a year".

Speaking in BBC documentary Sharon and Ozzy Osbourne: Coming Home, which was filmed prior to Ozzy's shock death in July, Jack said: "Emotionally ... I think it's gonna be difficult for sure.

"I can't spend a lot of time there [in the UK]. You know, it's like, I can go ...