Eragon

Hi class, have been reading one of my favorite books Eragon. The book is a fiction book about a boy who lives with his cousin and uncle. While Eragon is hunting in the Spine(a long row of mountains the hardly anyone climbs in) a blue stone comes out of nowhere and he brings it back to his house. During the night it starts to move and then it cracked open and there was a blue dragon inside.The dragon grew really fast so he had to keep it out side away from the house because he was afraid that his uncle would kill it or not keep it.

Some of my questions are, How did the egg get to Eragon? How come Eragon was living with his uncle not his mom or dad?

Thanks for reading, JB