Hey Daffodil Grimstone and Gus Lissington

More family! Her cousins would know Thea's advice and nitpicking only comes from a place of love and wanting to see her family happy, she loves her family very much. Her cousins also, being of similar age and having grown up together are probably used to it and know how to shut her up with the right look. It would mostly be Millie as her much younger sister that bares the brunt of a more instructive nitpicking. Specifically regards Zinnia Gallagher she is much more annoyed by the people being mean and gossiping than she could be about what is admittedly (in her mind) a silly thing to do. But I can imagine Zinnia would give her a "just dont" look before she even opens her mouth and the Thea makes a zipping gesture before just enjoying her cousin and her baby cousin once removed. The judgement side is probably again more apparent to Millie when they are alone together as something if a cautionary tale. It would be fun to do a thread, perhaps a family event or trip.

Dorothea also probably needs her cousins for advice as they have found husbands and she had not.

Regards Gus Lissington, as Thea's ward is both blind and partial abled (Hyacinth Valenduris) , it is likely that Thea has interacted with the professors a little more than a lot of guardians to help them meet her needs so they may well have crossed paths and gotten to know each other at least a little.