With the two toddler skills for the toddler requirements, does the heir in question have to read the logic books as well as master the peg box if that's one of the skills? Or can they just master the peg box and call it a day? The Rusts might be unofficial now, but I'm trying to follow the other rules and I kind of lost track of which toddler has read what logic books (both eligible ones have mastered the peg box and the xylophone, but I think that they both have another logic book to tackle).