Your story had potential. it would have benefited from further development to flesh out the relationship between father and grandfather, and grandfather and grandson, and the reasons why they had not returned to San Narval sooner eg: while the grandfather was still alive. The intro was a little confusing as the grandson's name changed from Jake to Lucas which immediately reminded me of Miss Peregrine's Home for Peculiar Children where the MC, Jake, loses his grandfather, whose dying wish is for him to go to the island. Of course, your story is different, and inspiration can be gleaned from anywhere, but it is better to proofread and edit, and at least ensure that your characters names do not change during your story ;-)