Pobby and Dingan are real?

I think Pobby and Dingan are not real. They are just imaginary friend of Kellyanne. In beginning of chapter one, Ashmol said, "Mum, why do you have to set places for Pobby and Dingan? They aren't even real." Also before that, he said, “They never existed. Things that never existed can’t be dead. Right?” This two sentences told us that Pobby and Dingan aren't existing in real life. Ashmol and his father don't believe about Pobby and Dingan. The book said, "Me and him never took Pobby and Dingan seriously one bit." Also his father is frastlating about it. He said, “Jesus! That girl’s round the twist,”  His father wanted her to make a real friend. Her mom is understanding she is different than others. Also after his dad started to try to believe Pobby and Dingan, Ashmol said, "Well, I got to admit it was a funny sight seeing my dad heading out holding hands with two invisible people." This is telling us that Pobby and Dingan aren't able to see. That means they are not real and they are just imaginary characters of Kellyanne.