Yep, getting engaged to Auguste fixes your family’s rep, and romancing them non-engaged does too, as long as you aren’t in trouble for helping Lady Renaldt. Romancing Rosario, whether you get engaged or not, and regardless of any plot happenings, helps your family a ton.
Hartmann and Blaise were good friends but the combination of Blaise not being made Head Prefect, plus the family troubles, made Blaise a lot more grouchy towards Hartmann. Neither of them are super emotionally open and Blaise in particular is very proud so it was a situation where an honest conversation between friends would probably have fixed it, but they were both a bit too prickly to do that.
Gonzalez isn’t super technically good but is very enthusiastic and joyful so people enjoy hearing it.
Hartmann is OK and would sing in a choir but wouldn’t do any public performing in a solo or duet situation, they’re not all that confident with it.
Max loves to sing!
Freddie enjoys singing and whistling when bustling around the place but wouldn’t perform publicly.
Delacroix isn’t all that musical and if they were caught whistling or something, would be self conscious about it.
Karson has a nice voice and would definitely sing in a group setting given the chance.
Auguste is dreadful and will not even countenance singing in public (they dislike doing anything that they’re not at least near-perfect at)
Rosario has a lovely voice and was taught to sing from a young age - they’re pretty confident at it.
Florin is great at singing but rarely performs. You might hear them singing in the shower.
Edit: oh, I forgot Blaise! They are pretty good at singing, but they’re a bit self-conscious. Over time they might get more confident with it.