Nobody in TFA treats Rey’s lineage as important except Rey. Everybody else is just like “who’s this randomer, using the Force?” The movie explicitly shows us her parents abandoning her on Jakku with Onkar Plutt. Your mistake is over-interpreting random casual remarks whilst completely ignoring the blatant indicators…

You mean apart from the master lockpick selling them out, telling the First Order about not only the escape plan but how to find them and allowing them to decimate the resistance forces, thus causing Holdo to suicide run the First Order fleet allowing Rey to escape and then setting up the last stand/siege at the end.