Re: instrument-instrument rels:
I’d agree that in the transverse flute page for example (ignoring the “children” issue because that’s just a placeholder) stuff like “soprano flute” (a specific version of western transverse flute) shouldn’t be equivalent to stuff like “sáo trúc” (a separate, although similar, Vietnamese instrument). I don’t really have any great ideas on how to name the possible separate relationships though, since a sáo trúc is definitely a type of transverse flute, but it’s not a type of the flute we usually think of when we use the word (what Wikipedia refers to as “Western classical flutes”).