They were showing the symbols so we could tell the difference.
After that, when the current king and queen (sun and moon) had a child it was the star. After that, the star would marry (a sun or moon depending if they were Male or female) to produce another star. And the cycle continues.
In summary, each star married and never produces a third star themselves. So those stars would marry and so on.
I had some fun and made a random family tree as an example:
♤ = king
♡ = queen
☆ = child I put f or m for if they were born female or male
♤+♡= f☆
F☆+♤=m☆
M☆+♡= m☆ & f☆ (this means they had 2 children, so two stars)
M☆+♡= m☆
F☆+♤=f☆ & m☆
And so on. No third star was born between a single member of royalty and their partner. They only had two at most.
sorry..im lost at the sun, moon and star...can someone explain to me?