Am I too late to stop my son from drifting away?

HE REALLY IS BEING TREATED UNFAIRLY. HIS BROTHER AND SISTER GOES WITH THERE GRANDPARENTS THEY BOUGHT HIS SISTER A CAR. WHAT HAVE THEY BOUGHT HIM. WHY DONT YOU VISIT HIM WHY DONT YOU INVITE HIM TO COME SEE YOU. I WOULD FEEL THE SAME WAY.