How much to the fam respect or believe Isolated Stargazer Siffrin surrounding their stars and faith and wishcraft and the like? Also does Siffrin have any feelings towards to change belief?
At the start? No respect at all :( They know there is something strange with Siffrin since he know a language that give people headache, but the idea of the universe is too strange to be accepted without internally going 'you seem kind but I do think you're crazy mysterious stranger that may or may not be cursed' ----> the curse is an odile theory. She has many theories.
Isabeau is a traveler that likes to learn about new cultures, and he had met one or two people that know about 'stars' before so he is the first one to believe Sif and consequentially the first one Sif actually tries to go out of his way to... talk to.
Mira and Odile take some time to believe Siffrin but his wishcraft, his ability to read the headache books, how insanely fleshed out this 'stars and universe' history are, his ability to be mature and calm about his obcessions, and their growing fondness for the researcher, made them eventually believe and respect sif, which does surprise Siffrin a lot, make them very happy.
Bonnie is a kid, they were unsure at first, since Siffrin is nice but also crabbing weird, and no one else talk about stars, but after Siffrin cast a protection craft on Nille? Oh boy, Siffrin became so cool to Bonnie, stars are awesome, they respect the hell out of Siffrin and his stars, even if some of it is complicated (heavy science aspects).
Siffrin has many feelings about the change beliefs, mostly frustration though: The Houses are places known for their acceptance yet they consistently disrespect his beliefs. People are rarely explicitly rude about it but that is arguably worse because Siffrin (specially fresh out of his decade long isolation) isn't the best at social cues and sometimes it takes a moment for them to realize that the people he thought was genuinely interested in the universe are at best indulging him.
Siffrin admitely doesn't know much about the change belief, he didn't come to Vaugarde to explore, he was forcebly dragged out of his studio/home and struggled hard. They will respect the change belief way more by the end of their journey with the party but i don't think they'll ever be fond of it...