The phrase "natural affection" refers to the instinctive love and care that people or animals naturally feel towards their family members or loved ones. Full definition
Rom 1:31 Without understanding, covenantbreakers, without natural affection, implacable, unmerciful: (religion.blogs.cnn.com)
«The evidence, including the mother and stepfather's own testimony, indicated that they held the father in low regard, degraded him in Jamie's presence, depicted him as an evil person with whom Jamie should have no contact and engaged in persistent efforts to destroy Jamie's natural affection for her father. (againstpas.org)
For the soul mixes with the wine of God's love the milk of natural affection, that is, the desire for her body and its glorification. (firstthings.com)