The basic premise of "family" is that parents have the right to decide what happens to their genes. Which would be true, if those genes weren't attached to a conscious being. Being a child is being shanghai'd into a license agreement to utilize/propagate someone else's genes.
Certain reciprocation is made both as a direct exchange and as concession to the inequality and coercion of the relationship. But the nature of the "contract" is rarely made explicit, which is unfortunate, partly intrinsically, partly because it prevents exceptional nullification