Immediate family of the Buddha
1. King Suddhodana (Father) - Became a lay arahant
2. Queen Maha Maya (Mother) - Passed away 7 days after giving birth to the Buddha, reborn as a deva (god) in Tusita realm.
3. Maha Pajapati Gotami (sister of Queen Maya who nursed and took care of the young Sidartha) - became an arahant (female nun)
4. Yasodhara (sidarta's wife) - She attained Arahanthship and was declared the chief disciple among the nuns who attained supernormal powers (Maha Abhiaaa) to recall infinite eras of the past.
5. Rahula (buddha's son) - Became arahant. Rahula passed away before the Buddha, Sariputta and Moggallana. The Buddha declared that Rahula was foremost among the monks for his high standard of discipline and obedience. Rahula, who had entered the order at the tender age of seven, was a role model for the younger members of the Noble Order through his obedience and pleasing nature.
As we can see, all the Buddha's family benefited from Buddha's enlightenment. The Buddha gave them the deathless state, and certainly did not abandon them after attaining enlightenment