I see some common ground between my kind and thin-bloods.

Small explanation for new guys: Thin-Bloods is a term used to describe vampire orphans and weaklings. See in Vampire the Masquerade there can be a "windows error" when you become a vampire. In most cases it causes weakness of the vampire, simply making him/her less adept in using vampire powers and develop. Most vamps would simply "put a thin-blood out of their misery" but some choose to just dump em whcihs is an irresponsibl thing. They become targets to ridicule and bullying, one. But they are not introduced vamp politics, social-structure, rules and so may become threat to whole vampire-kind.

Thin-bloods is also used to describe a more interesting thing. In VTM universe unlike in other universes vampire blood is a "limited edition" thing. You can't have one vamp make a new generation and so on infinitely. There's a limit of 13 genereations from the original vampire, Biblical Caine. 14th generation has so much "Thinned Blood" they are in the line between human and vmapire, some are daywalkers, some can even make babies, some may have every vampire weakness without a single vampire strenght and in some extreme cases theother way around.

And the girl? Clan Tremere are Warlocks, Mages and Wizards of the vampire kind, often called Usurpers cause they are an artificial vampire species, not made by ancient antediluvians but scientifically induced theft of immortality. They are hated and shunned by all other vampires, but unlike thin-bloods they are useful so they have a place in vamp society... Only cause of convenience.