Philippe Bianchi says he still does not know if the Frenchman will ever recover from his Japanese Grand Prix crash.
Former Marussia driver Bianchi is still in a coma in a French hospital over five months after the horrific Suzuka accident that left him with grave head injuries.
His father Philippe admitted it is very difficult to cope with the situation, especially not knowing if Jules will ever wake up or not.
However, Bianchi Sr is hopeful his son's fight will have a positive ending.
We have to be strong, like Jules and for Jules.
"Jules is still in a coma. As long as he does not wake up, the only thing we can do is wait," Bianchi's father is quoted as saying by Gazzetta dello Sport.
"It takes patience, a lot of patience, but it is difficult to know that at any moment a terrible call could be coming from the hospital.
"We have to be strong, like Jules and for Jules.
"As long as he is in this state, the doctors cannot say anything. He might wake up or he might not.
"I think he will, as he has not fought with us this long for nothing."