Reference: Fataawa Noor ‘alad-Darb – Question No.6449, Page 277, Volume 12
Question: What is the best thing a Muslim can do for his parents during their life?
Response: The best thing a person can do for his parents during their life is to treat them well – as Allaah has commanded; Allaah (Jalla wa ‘Alaa) said:
…[and] this differs from benevolence [towards them]. [Benevolence] can be in speech, and it can be in action, and it can be with wealth. Importantly, you should do everything that amounts to being benevolent to your parents – according to [the best of] your circumstances.