Duty!!!

My tryst with the Bhagavad Gita continues, gradually.
Slowly and steadily, i read those verses and their meanings.
Trying to read those and get "cleansed".
:-)

The source of the Bhagavad Gita, they say, were the words spoken by Lord Krishna to his disciple Arjuna, to give him the mental strength to fight the battle against his own clan comprising of his near and dear ones.

In this particular verse which i read , 2:15, to be exact, Krishna tries to tell Arjuna that sometimes you have to break the bonds with your family, for the higher duty/goal. The ties in the materialastic world shouldn't hold you from attaining the higher goal.

Here, an example of Lord Chaitanya is quoted, who, at the age of 24, leaves his old mother, his young wife and children, to feed for themselves, and he goes to attain the "spiritual bliss".

But, this proved to be a little uncomfortable for me.
He did break the ties with the materialastic world for the spiritual attainment, understood, but, didn't he shun his basic duty?
The basic duty of taking care of his old mother, who had brought him up throughout his life.
That of taking care of his wife and children, for whom, he was the only support.

What's the point in attaining a higher goal, if you fail at the basics?
What's the point of attaining the spiritual bliss if you left other people, leave the ones around around you, in total abyss?

Which is exactly the duty, the "higher one" or the "lower one"?