sure! this is a copy/paste from when i took on the role of the sister:
they are half german jewish (with some italian) on their mom's side and irish christian on the dad's side. florida natives and they grew up in st. augustine. it was her and the older brother for a while and then seb was the later "surprise" baby. their mom and grandma on that side is talked most about and very fabulous feminists who are obsessed with barbra streisand and the other divas there ever was. their dad is basically a clark griswald. mom is likely though getting the itch for the older siblings to settle down and have babies while seb is always the baby and is a-ok about him being a bachelor for at least a while.
rebecca here was a standard good girl until the last half of her senior year. she became pregnant and ended up having an abortion, which contributed to the end of her relationship and afterward she went a little crazy. she's more settled now, works as an emergency room nurse. seb is the baby of the family, co-owns a haunted house with his best friend and works as a guitar teacher.