Wile Paper was new to him, #40257 paid so much attention to them, and showing them everything he could. However - #40257 isn't really the best person/skeleton/monster to be a parent.
Paper was traumatized by seeing #40257's body all over the place (even though #40257 could easily fix himself right back up - which he did and it still didn't calm PJ down until several hours later). he panicked and shouted at Paper, calling them a “mistake” and “an abomination that shouldn’t have existed” before disappearing. Paper screamed - what else were they supposed to do? #76691 noticed them and felt an odd connection (which #40257 did as well) and he really didn't like how that felt within him. Eventually, they find the two at the end of a battle - where Ink's (#40257) body was scattered all over the place and Error (#76691) was about to do one more strike. They were created by Error and Ink (on accident) from the remains of an alternate Error's scattered strings and an alternate Ink's leftover piles of Ink scattered about the multiverse, which took a process of about three years, Paper Jam started to walk through to see where they ended up at. 2.1.2 After Self-Discovery Main Appearance:.