An 80-year-old man was sitting on the sofa with his 45 years old son. Suddenly, a crow perched on their window. The old man asked his son what was that, and the son answered him that it was just a crow.
The same crow appeared for a second time, and the old man asked his son again.
The son replied for the second time that it was a crow. The crow appeared four times more, and when the old man asked once again what was that, the son burst and yelled to his father.
After a while, the old man got up and handed his son an old diary that had been writing in since his son was born. In the diary the old man tells how when his son was two years old asked 27 times about a crow that kept appearing at their window. The father maintained his composure and answered kindly to his son 27 times.
While the son got irritated after being asked four times by his father, his father in his turn treated his son warmly and was comprehensive with him. If your parent is old, do not treat them as a burden but be kind to them.
Say good words to them, no matter how they behave.