نص قرآني / حديث شريفAllah places kindness to parents right after worshipping Him: "Your Lord has decreed that you worship none but Him and that you be kind to parents. If one or both reach old age with you, do not say to them a word of disrespect, and do not scold them, but speak to them noble words" (17:23). He adds: "Lower to them the wing of humility out of mercy and say: My Lord, have mercy on them as they raised me when I was small" (17:24).
نص قرآني / حديث شريفA man asked the Prophet ﷺ who deserved his best company the most. He said: "Your mother", three times, then "your father" (Bukhari 5971, Muslim 2548). Obedience is required in what is lawful; if parents ask for something that disobeys Allah, one does not obey, but still keeps good manners (31:15).
Practical kindness: visit, call, listen, help financially if needed, and pray for them, including after their death. Schools of law and scholars differ on some practical details; this lesson gives the common principles and flags differences without settling them. For your own situation, consult a qualified scholar.