Free-Spirit_99
I planned out each of their families already and wanted to bring her in soon and then you introduced Scott and so today I was thinking we could cause a little bit of drama between her, Rai, and Scott, if you think she fits (which is why I asked Scott's age to make sure worked). If not, I'll still be using her, just not for that. (Let me know what you think please).

Thea Lauder, Rai's half-sister, sharing the same father.
16
Thea is pretty adventurous and likes to go by her own rules, and by that I mean she often just does what she wants and doesn't care what others say or think. Rai can be quite protective of her, despite them not being completely related, which can often lead her to be more rebellious than she already is.
Thea can be a little too much like her brother and just flirts with whoever she wants whenever she wants, ignoring any protests others might have. Though she hasn't gone further than flirting or kissing yet, Rai can't help but worry she'll do something she'll regret and is often the reason for relationships ending. She loves her brother, but she's also very annoyed by his hovering and hypocrisy.

Not exactly the way I wanted to phrase all that, but I'm sure you get it.