I suspect a diagnosis of Cataplexy however they clearly need more tests done. I think they are irresponsible to have not seen anyone about this before now. They collapse with laughter on a regular basis and so far are lucky that it only occurs when they are together/on the floor. What would happen if Peppa/George were up on a climbing frame? Or if Daddy pig was driving? :( Perhaps the SW department should be called - who runs that? Probably Rebecca Rabbit?
Feel free to add your concerns about any other TV characters - for example the neglect of Charlie and Lola!