All of my children are extremely unwelcome by nature, any idea how I can avoid this?
If you want to know the specific details, check the DFHack console after communing with nature.
Avoiding it is mostly a matter of protecting your pets, especially those caught or recruited from the wild. The quickest way of boosting your score is to release high-value animals into the wild. Opening up the first-layer cavern, setting up some cage traps to capture and tame giant insects, and then releasing them can raise your score a lot. Also, giant spiders of all kinds should be regarded as sacred animals. (Their high pet value makes them very valuable to have with you or release, but killing them can knock down your score a lot. Kind of a problem when the wild ones insist on attacking your pets...)
Also, make sure you aren't keeping any natural wild or tame animals in cages. That hurts your score a lot, but it will go back to normal once you let them out.