Thank you, but it's not mine, author unknown or I would have credited it

You left it under my bed

The sister would also be the aunt if the dad had the son with one woman and also had a daughter with the mum's mother. Because that child would be the mum's half sister, so therefore the aunt and also a half sister on the dad's side because they share the same father

0 - 60mph in pppfffftttt

Prepare yourself for the real world