i can offer up faces depending on how old you wanted to pb her, but there's some family history in his bio but basically she'd have lived in foxholm with their mom for a lot longer than he's been back, and their mom disappeared which was why he moved there. i was thinking the sister is a bit less put together than he is and has sort of been a little more wild and unambitious which was why he sort of had to step in to take care of their mom's business