Haddock Gone Missing - How To Train Your Dragon

What if it wasn't Valka who got captured by Cloudjumper? What if Hiccup had a sibling? What if Valka had died of an illness long before they experienced dragon raids more often? What if Cloudjumper had a different rider?
Y/n Haddock was taken from Berk long ago, years after their mother died of an illness Gothi couldn't cure. The chief of Berk was torn by the loss of two family members but kept going for his son and for years he and Hiccup had worked to build a safe home for dragons. When Hiccup and Toothless, his Night Fury go missing one day his friends and father try to find him. What'll happen when a new threat appears? What'll happen when Berk goes to shambles once Drago Bludvist attacks them using his Bewilderbeast?