What is the appropriate advice for reuniting with a son who became hostile towards his parents due to his feeling that they neglected him during his long illness, and his attachment to the doctor who cared for and taught him, followed by his marriage to that doctor's daughter?

Summary:

It is emphasized that what the parents did by abandoning their sick child in the hospital was a grave sin. It is affirmed that Allah prepared a doctor to raise him and treat him kindly, and it is made clear that the son loved his foster parent more than his biological parents, whom he never knew. The parents are advised to repent to Allah, be grateful for His blessings, treat kindly the girl their son chose as his wife, and mend their relationship with their son and his wife to turn over a new leaf and reunite the family.