Genesis 25:28 - Joseph Benson’s Commentary on the Old and New Testaments

Isaac loved Esau The conduct of both these parents was blameable: they had but these two children, and the father was peculiarly attached to the one, and the mother to the other. And this improper partiality gave occasion to that strife which once threatened their being deprived of them both. Such partiality should be carefully guarded against in parents, as being both sinful in itself, and of dangerous tendency. It is true some children may be of a much more amiable spirit and conduct than others of the same family; yet all ought to have a due share of parental regard, and none be in any manner slighted or neglected.