HTTYD Next 2 generations

I do not own any of the original work like the dragons and such but I do own most of these characters and this plot. If you haven't seen or heard of the spoilers of the third movie. Then don't read this book.

In a land, well more like on a island, lays my home. We were simple- well not even that simple. We were Vikings. We lived like Vikings, we hunted like Vikings, and even yelled at the dinner table like Vikings. Yeah, kinda scary. But not me, I'm not like a Viking and that's okay. But I feel like my dad doesn't think I'm a great child because well I'm not a viking. His name is Hiccup Jr, the son of the dragon rider. Which is kinda silly right? Dragons are a myth, and my grandpa, "the dragon rider", is not real. I've never believed in dragons but my dad will tell the tales of him riding a black dragon that roam through the night with his dad. It seemed like a story to me. But my older brother thinks otherwise, he makes it his quest to find the dragons. Well, news flash bro, they aren't real...