Basically Milk and OJ are technically siblings, having no parents
They're chaos beasts, a creature made when a universal catastrophic event occurs, that can only possess objects or soulless bodies, so Milk and OJ are chaos beasts possessing a milk carton and an orange juice carton
Milk is about 29, and the most mature, he's a therapist, and had a very violent past, as he used to kill needlessly, before it wasn't fun to him anymore, he's basically a father figure to OJ, and stops her from murdering people
OJ is 20, and is incredibly violent, silly, and anger-filled, she is always observed by Milk, so she doesn't kill anybody
I have a lot more lore