Need to change the details a bit to make this less recognisable... hm.
A family member keeps getting pets. Their children aged 7 to 12 are quite keen on them, but don't really take care of them - it's more about getting a new pet, then they lose interest quite soon, so the parents end up taking care of them.
Over the last 12 months, the fish boiled to death died because they forgot to move the aquarium out of the very hot conservatory in summer. A snake died of starvation and they didn't even realise that it hadn't moved for several days. The puppy was run over by the family car. The kitten ran away and was found dead in a ditch.
AIBU to think that adding more pets to the menagerie at this stage would be somewhat irresponsible? And to not want their very, very patronising childcare advice either? 