A mother's love is everything, Jared. It is what brings a child into this world. It is what molds their entire being. When a mother sees her child in danger, she is literally capable of anything. Mother have lifted cars off of their children, and destroyed entire dynasties. A mother's love is the strongest energy known to man. You must that love, and it's power.
There is a distinct difference between the ability to create life and the innate need to protect it; to cherish it. The life you've created is the one being you love most in the universe, and that intense love evolves into something that goes far beyond a sense of duty. It is instinct; pure and undeniable. As a direct result, one must neglect all else to preserve it. Even those we have claimed to love before.