Los Angeles - Justin Bieber's poverty-stricken grandfather thinks the singer ''has forgotten'' his family.
George, 61, cannot work because of a painful back problem and he has revealed he and his wife Kathy - Justin's step-grandmother - have received no support from his superstar grandson.
The lack of help comes despite the Beauty and the Beat singer's grandparents having very limited income and living in difficult conditions - a hole in the roof caused by a falling tree goes unfixed.
George said: ''Justin has just got too big for his britches.
"He never calls us and now I sometimes think he doesn't care ... [He] seems to be getting caught up in this lavish lifestyle and has forgotten us.
''When I hear about his recent behaviour I just wonder who on earth is looking after him as, believe me, this is not the loving little boy we always knew.
''It's like we now live on different planets.''
As his grandparents continue to struggle, the 19-year-old pop star recently endured a difficult and controversial UK trip including a confrontation with a photographer and turning up two hours late for a show.
And he is apparently able to help his maternal grandmother and her second husband, which upsets George.
He told The Sun on Sunday newspaper: ''For them nothing seems to be too much trouble.
"He buys them new houses, cars, luxury holidays - anything they want. But for us - nothing.
''I would love a new house as now I cannot even make it upstairs, my back is so bad. But I guess that is not on the cards for us.''
He admitted their situation is becoming ''desperate'' and he can't grasp the level of wealth his grandson now enjoys.
He added: ''Justin might be worth £70m (about R985m), but we certainly have never seen a penny of it. It does make me sad, as right now our life is pretty desperate.
''It's had to imagine the money Justin has, as it's about as far removed from our life as you could get.''
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