If anyone was wondering (no one was), the most Thirteen + her brother song Ever to me is Hartebeest by Yaelokre. The whole song, but especially: "Where do we go when the river's running slow? Where do we run when the acres turn green and the cats kill one by one? Little rabbit (run, run, run, run, run)" -> something something both of them growing up learning they could eventually get sick and both of then testing positive as adults, knowing they're on limited time, knowing that time is running out. Their mom going, then Thirteen's brother going, and her living with the weight of being the last one left standing. The lyrics match all the way down to "little rabbit (run, run, run, run, run)" because in my headcanons, Thirteen's brother Jay's nickname for her since she was a baby has been "Rabbit". I will never not be screaming crying throwing up over these two