Here are a couple of ways to say "your children" in Hawaiian:
* ʻO kāu mau keiki: This is the most direct translation, meaning "your children."
* ʻO kāu poʻe keiki: This is a more formal and respectful way of saying "your children" and means "your people/group of children."
The specific phrase you use will depend on the context and the relationship between the speaker and the listener.