Y/n Buckley was bucks and Maddy’s younger sister (only two years younger than buck). She and buck had a shitty experience with their parents especially after their sister Maddy ran away from home, y/n never understood why her parents treated her so harshly compared to her siblings… when they were finally old enough they moved away, and while buck didn’t know what he wanted to do and traveled y/n knew, her and buck both had this big sense of adrenaline, but y/n also knew she loved to help people. So she moved to LA (far away from her parents) and trained to be a firefighter and was immediately poached to join the 118. When she was there she made family with them all, Bobby became her father figure, showing her what a real dads love and care felt like, Athena took on that mother role her Stern and protective love making y/n feel so so cared for. And hen and chimney adored the girl like a little sister. Years later buck joined his sister in the 118 and joined the family same with Maddy when she ran away from her shitty ex. A few years or so after buck joined, Eddy Diaz joined the 118, and after a year or so of y/n and Eddie pinning after eachother, they finally got together, and have been for the last 6 months, their family loving the fact that they were finally together (especially Christopher, eddy’s son who basically bullied his dad into finally asking y/n out)