A mother and A father

A mother, there's a definition, yet there is none, it's a role we have to fulfill, yet we each perceive it differently, A mother, they blood is thicker then water, but why did I find a mother in a stranger. A father there's no definition for a father, yet the society says differently, it's a role we have to fulfill, and yet again A father, was more like water then blood, My father wasn't water or blood he was air, he was a thought, he was a hope, and yet I hoped I'd find a father, maybe in the start lit sky or the moon, I hoped I'd find him in a stranger.