If your family can’t afford to visit Boston, it will surely be difficult to afford paying BC’s tuition, never mind travel expenses. Hopefully, if you get in, you’ll get a very substantial financial aid package.
As novafan noted, don’t worry about your not coming up hurting your chances. All in, 4 years here (or at many other private universities) will cost over a quarter of a million dollars - truly a daunting number for many!