The Children cannot mate with each other. Only the males can mate( except for the Children of the Virus) with female woman. The proscesses is very diferent from each other.
With the Children of the Night they "mate" with a female Human while in human form. They abduct the human and take them to a hatchery. The hatchery is where all the pregnant females are taken, and is an undreground cave complex. After 4 weeks the baby claws its way out of its mother and feeds on her.
With the Children of the Sun they agian, only males can mate with humans. They get the female human pregnant and then 11 months of pregnancy later the woman gives birth. The baby and the women both become Cildren of the Sun.
With Children of the Moon they again mate with female humans. The pregnancy is just like any other and the baby grows up normaly. Then once the baby turns 7 years old the kid turns Wolf whenever the Moon is up.
With the Children of the Virus its quite simple. A male or female infects many people in order to survive, the Child of the Virus feeds of their life force to keep itself strong and alive. But if the Child of the Virus dies then all the people he/she infected form themselves into a coccoon. They come out of the coccoon a child of the Virus, but only half make it.
So you think you can fight the Children, Superhero?
Then you better get ready.
Because they are here to stay.