Ok, say your 5 year old took a library book outside and forgot it out there.
Your 10 and 6 year olds SAW that it was out there and did nothing.
You had no idea this happened until more than 24 hours after the fact. Your husband was working in the yard WHILE the 5 year old had the book out there, but didn't notice.
It is now soaked in rain and ruined and will need to be replaced.
Do you make your 5 year old help pay for it since she IS THE ONE who took it outside in the first place??
Do you have your 10 and 6 year olds contribute to the payment since they KNEW it was there, saw all the rain and waited hours and hours to mention it to you???
Does it have anything at all to do with anyone except the child who took it out there??
Or are the other kids partially responsible because they KNEW it was there and did nothing at all. Walked into the house as the rain started pouring down and waited until THE NEXT EVENING to casually mention, "Oh, did you know Princess left a library book about bugs out there yesterday morning??? I bet it's pretty wet, eh???" For all I know they partook of the book whilst out of doors. Sure, she took it out in the first place. BUT COME ON!! If you know it is there, either remind her to bring it in, bring it in yourself or tell me SOONER.
KIDS! There has to be a teaching moment here.
Really seriously wondering what anyone thinks the course of action should be.