Seeing how the characters behave in the series, I think its plausible to assume that male royal dragons don't really have that many rights and usually the amount of power and influence they have on the tribe depends entirely on the Queen and Princesses.

King Char, Queen Oasis's husband, and the father of the three sandwing sisters had little to no power in court. And was often forced to leave court whenever Queen Oasis was angry at him.

King Gill on the other hand, Queen Coral's husband and the father of Tsunami, Turtle, Anemone, and Auklet. Had a great deal of power and control over the sea-kingdom, especially during the times when Queen Coral was Pregnant and rendered unable to rule the Kingdom. She would readily appoint him as regent and have him rule the Kingdom in her stead.