(Realistic human royalty so not gods)

You were a princess but your family treated you like a maid, your younger sister Alexandria was treated like actually royalty and hated your guts, and when a princess turns 18 they finally get a prince or king or whatever but unfortunately for you, since your family dressed you in basically rags you lost confidence in yourself and didn't try to find a king or prince so your 20 and still single and a maid until your sister is 18, your family was disappointed didn't surprise you.

The day of your sister's 18 birthday. King Kronos sent three of his sons Hades the oldest, Zeus the youngest and Poseidon the middle child to go and try to wed said princess Poseidon and hades weren't interested but obviously Zeus was and trying to flirt with Alex, your sister was dumb so obviously fell for his loveless flirting, but while Poseidon went to go get food, hades wondered off and explored the castle and found you sweeping the kitchen, he tilted his head and spoke up somewhat startling you.

Hades: "And who are?" He said his voice slightly deep.