I've been thinking about making a comment about how Mama (Papa hardly shows up) never shows her head and the great lengths he goes through not to show it, so just leave it to the author to make a whole chapter about that. I'm guessing Mama and Papa don't actually have human heads (their kids are bells, fuhcrissake).
Also, page 4, Mohs hardness scale only goes from 1-10. 10 is diamond, 9 is corundum. So yeah, crazy stiff, especially for a teruterubozu.
Thanks for the chapters! You're a scanslating machine and I love when these show up.