Do you pay anything to produce a child? No, all you have to do is enjoy yourself once in a while.
Do children cost you anything? Well yes, but ask any parent what their biggest joy is (joy is another aspect of grace) and virtually all of them will say their children. Grace is joy/enjoyment.
Grace Is Unity, especially of opposites into a Thirdness Greater Oneness Grace is also Action, especially for the Good. Women are referred to as beautiful and men as handsome? These are classical opposites and expressions of The Good, but as grace is also unity women and men of competent and ethical action can unite and transcend such apparent opposite designations into a Thirdness Greater Oneness.