User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-4967138-20130415145957/@comment-6266020-20130417001148

I feel like Frank being a descendent of Poseidon is more of an equalizer and and explanation. Him being a descendent explains the shapeshifting power. Also, have you guys noticed that every other family memeber of the big three has a sibling: Thalia-Jason; Nico-Bianca-Hazel. I believe that instead of giving Percy a sibling for company, Rick gave him a great-great nephew. As for the Hazel thing, that is CRAZY. I never thought of that before!!