IX: 17

Chapter 9, Verse 17

"I am the Mother and Father of the whole Universe and also its Grandfather.
I am the one who gives you the results of your actions.
I am the sum of all knowledge, its essence and goal.
I am the Purifier, the syllable Om, and the sacred scriptures.

Sri Eknath Easwaran:

When parents in an Indian village want their sons or daughters to go to college, they look for a college in a place where they have relatives.  In addition to saving money for room and board, this arrangement provides a family atmosphere.  If students return a little late at night, they will be taken to task as if they were at home.

In this verse, Krishna assures us in his own personal way that he is responsible for us completely.  No matter how old we are, no matter where we stray, we can count on his support.  The other side of this, which he is too tactful to mention outright, is that he is not going to let us get away with a single, solitary thing.  He will keep on taking us to task, and severely if the situation warrants it, until our selfishness dies.

Swami Shivananda:

Ishwara or Saguna Brahm is the Father.  Primordial Nature or Para Prakriti is the Mother.  Satchidananda or Para Brahm is the Grandfather.

Paramahansa Yogananda:

Krishna is God, the Holy Spirit, the Mother or Cosmic Nature, bringing forth worlds through her Creative Vibration and dissolving them as well (Om).

Krishna is God the Son, his own reflection in creation as the Preserver, the Krishna or Christ Consciousness (Tat).

Krishna is the Unmanifested Spirit, the supreme Cause, Ancestor of God, Grandfather of creation, Cosmic Consciousness (Sat).

OM TAT SAT.