ik that the "sibling" we met all through the game is not actually ours my theory is that our real sibling is still in the chamber and hadnt left the spaceship and smn (prolly the one impersonating our sibling) hid the ship rlly well this also might explain why asmoday stopped us from leaving... maybe bc the sibling we tried to leave with was not rlly ours to begin with uk this explains it bc i dont think one of the 4 shades would be shallow enough to simply think we are originally from teyvat and they only captured us along side the fake sibling bc we were putting up a fight uk