Okay.. this is for the parents/granparents out there! :p015:
If your son had asked you if he could have a fish tank (if he payed for it himself!) and you said no because;
"We're not having anymore animals, you won't look after them"
but then you where on holiday and left his sister in charge... came back and there was a fish tank- what would you do?
Would you make him get rid of it? keep it and shout at him? Smash it into tiny pieces?