What do I do about this (please hear me out on this one)

So my dad started dating this girl her name for this will just say is... S? (This is not a real initial or name for some privacy) and so anyway my birthgiver (my mom who did a lot of messed up stuff like ACS and stuff which has been figured out and settled now) got my father arrested for a stay away order after she lied about him but he has full custody now and so anyway this girl is someone my father and his two sisters grew up with here in New York and she had a rough past and even an ex husband who we'll call...A and so S and A had a daughter who we'll say is B and so B grew up and has a kid we'll call F and a husband...I think? Who we'll call I and so they also had another younger kid like 16-15 so like a 2-3 year age gap from me who we'll call T oh and S had a stepdaughter from A who she considers like one of her kids as well who we'll say is H and a stepfather who we'll call X sorry for all the names and stuff but I just want to have some privacy for the people and some help too but anyway so we went to another state close by for T's birthday like a Waterpark and a beach and an arcade all by the hotel and while we were there I started to form an attraction to her but we're both introverts so we've never really talked which I do kind of a lot, I tell myself they're different sometimes but honestly I don't know why I feel like I like people before really even knowing them but so anyway now I don't really know what to do about it, it feels weird to talk to her because I like her and we're both introverts so ya know, but also I do want to get to know her better so maybe I could see if I like her personality and maybe really one day actually date or something but also I don't want her and I to be weird since we plan to move where she lives someday and she's kind of like my stepsister so I also feel like our parents might think it's weird too so I don't know what I should really do I mean I feel like eventually I'm not gonna want to stay silent but Idk if it's better to just never say anything or actually try and grow a connection and say something if I feel me and T might have mutual feelings so idk just some insight or some advice could help one friend told me I shouldn't say anything and that it'll ruin me but this one really feels different and I can't get her off my mind and so basically I'm just asking could you please help me figure out my next steps and all? Please and thank you thanks to anyone who made it this far and actually read all this because I'm not sure a lot of people actually will so THANKS ANYONE WHO DOES TRY TO HELP AND GIVE ADVICE : D