I've always preferred "why". If they were a family, Why would be the cute little one who's so curious about everything, and comes up with wildest explanations for stuff...
• previously ChildOfNowhere - they/them - literary fantasy with a fairytale flavour
A person is more than their experiences, stacked up like stones... Our best moments are the foundations we use to reach for the sky. — Yumi and the Nightmare Painter by Brandon Sanderson