@MMarciano,
Put it out there into the Universe and say "IT'S OURS" ... You no doubt will have to negotiate or else you would have heard something by now.
Where you there meeting them as a "whole family" ? From my experience, people that have lived somewhere for years, tend to want a family that will stay and look after it as their own for the next 25 years. Just a tip, if they don't agree with negotiations that you can use.
PS:- If those gals are so feral, you can't have your Sister move into yours