Sahih Bukhari Volume 8, Book 73, Number 2:
Narrated Abu Huraira:

A man came to Allah's Apostle and said, "O Allah's Apostle! Who is more entitled to be treated with the best companionship by me?" The Prophet said, "Your mother." The man said. "Who is next?" The Prophet said, "Your mother." The man further said, "Who is next?" The Prophet said, "Your mother." The man asked for the fourth time, "Who is next?" The Prophet said, "Your father."

"Paradise lies at the mother's feet"

Your mother and father have taken care of you since you were born. It is because of them and the grace of Allah that you are who you are, and that you have what you do. You are a very lucky person! So as they take care of you, they are counting on you to behave, listen to what they say, and be the best son or daughter you can.

When your parents get older and can't take care of themselves so well, you'll get your chance to help them as much as you can.

Here is an ayat from the Holy Qur'an that tell us about the importance of our parents!

Surah AL-ISRA (THE NIGHT JOURNEY)17.023

Thy Lord hath decreed that ye worship none but Him, and that ye be kind to parents. Whether one or both of them attain old age in thy life, say not to them a word of contempt, nor repel them, but address them in terms of honour.