Wouldn’t it have been the owner of the slaves that sold their children into slavery to other slave owners?
Yes. The owner of the slaves would have sold their own children into slavery.
That is exactly what the black slave breeders did. They were slave owners and they impregnated their female slaves and sold their own children.
People have been brainwashed into believing that all blacks in this country were slaves. Not true. There were thousands of free blacks and free black slave owners.