Ibn ‘Umar said:

“The messenger of Allah صلى الله عليه وسلم said, ‘The best form of dutifulness is that one maintain relations with the people one’s father loved.’” (Authentic)

Commentary:
When Ibn ‘Umar, may Allah be pleased with him, traveled, he took along a donkey which he rode whenever he got bored on his camel. He passed by a bedouin who was a friend of his father’s. So he gave the man his turban and the donkey.

The virtue of maintaining such relations with the beloved ones of one’s father could be better taken bearing in mind that such relations bring about mentioning one’s father with good and praying for him. So it counts as from the child’s kindness to his parents. The hadeeth proves that good deeds are of categories.