Nephilim, Limon, and limon can have soulmate bonds, but demon based bonds tend to mirror obsession without true devotion. It is said that when a demon forms a deep bond that it is a dangerous thing. None of the demon children are raised by the demons that produced them but sent off to special schools. The children are brought back as teens to learn the ways of their realm.
Since all these creatures are part human, they are born with inherent free will and are not required to serve the gods. Most choose not to serve the god of their parents since the angel and demon are forbidden to speak about who they serve and will tell their children what humans are told. To have faith. Each of these categories have varying levels of purity since many reproduce and reproduce again. Watering down or enriching the bloodlines over time.