a parent-child relationship is just that: their relationship. It's not my place to tell them when or how they should honor either of their parents. And >I< don't get to be offended because a child sees their mother as mom AND dad. If that's how their relationship is, then who am I to opine about their relationship.

THAT SAID, to me, mothers are mothers and fathers are fathers. Father's Day should be about fathers and Mother's Day should be about moms. If you don't have a father, acknowledge the other men in your life who support and love you. But let that day be to acknowledge father figures.