What is the ruling on a father who abandons his son, neither seeing him nor asking about him from childhood until he grows up, and refuses to see him even when the son initiates contact and visits?

Islamic law has established rights for the son over his father, including care, financial support, and guidance. The father's actions, as described, are contrary to the teachings of Islam, for he is a shepherd and responsible for his flock, and "It is sufficient sin for a person to neglect those whom he is responsible to feed." The father's refusal to see his son constitutes a grave severing of kinship ties. The son has a right over his father to maintain connection, good treatment, and compassion. Despite the father's neglect of his son's rights, the father's right remains and is not diminished by anything. The son must strive to end this estrangement, for the one who maintains ties is not the one who reciprocates, but rather the one who maintains ties when they are severed, and he will have divine support as long as he does so.