With thanks to the original author. :) Comments, suggestions, and so on are sought and welcomed as always!
Looking eastward, we see the Mother and Father as children. Everything in the world is new to them, so their greatest drive is learning - learning as much information as possible, learning skills, learning how to think and reason.
Looking southward, we see the Mother and Father as teenagers. They are driven by passion, whether it is the passion of their newly awakening sexuality, or the passion for causes and ideals.
Looking westward, we see the Mother and Father as adults. They are parents or teachers or mentors or other similar figures. Their function is nurturing, promoting the physical, mental, and spiritual growth of those in their care.
Looking northward, we see the Mother and Father as elders. They are the holders of wisdom. Wisdom comes from knowledge, experience, and perspective, and includes knowing when to speak out and when to keep silent.
Looking inward, we see the Mother and Father as ourselves. Whatever age we are, whatever our individual place on the path, we are our own Mother and Father. They wear our faces...and we wear theirs.