Logical to me, anyway.
Since the child who typically occupies the "way back seat" in the van has the habit of leaving her clothing, jewelry, books, pencils, and other paraphernalia all over the seat and floor in her general area (not to mention a good deal of trash), and
Since said child insisted that she did not have any clothing in my van as recently as yesterday, and
Since I went out to the van this morning and removed one denim jacket, one hoodie sweatshirt and one pair of pajamas, all belonging to her,
MIDDLE SISTER gets to vacuum the van today!