The former child star has been pictured looking gaunt and thin, clutching his stomach and appearing to vomit in the street and his parents fear that he is heavily into drugs or that he is seriously ill, reported Sun online.
"Kit has seen the photo. But he can't talk about it. He just can't, because it hurts him too much. Of course he's worried, he's incredibly concerned," Jeanette said.
"When I saw the photos I thought, 'Oh no, this is not good. Either he's dying of some disease or he's heavily into drugs," she added.
The child star quit acting aged 14 and later had his parents blocked from legally controlling his 11 million pounds fortune, leading to the breakdown in his relations with his father.
The actor, now 31, lives a reclusive life in New York, and it has been claimed he has a 3,800 pounds-a-month drug problem and an addiction to painkiller Oxycodone, which could kill him in the next six months.