Loki gives great advice and assuming OP has not already made the decision, I think the skill you learn in law school is to use common sense, which hopefully you did.
As OP states he should choose the school he/she likes best. Not a difficult conclusion, which is bolstered by the fact that OP has family in BU, he/she like Boston the best and Boston is offering money and BU is actually cheaper per year in Tuition than GW or Fordham.
So the choice is attend a school near your support system, in a city you enjoy, and will cost less.
Or attend GW for example, which is not near the support system, not the City OP is familiar with and will cost more. However, the perk is that in 2015 U.S. News put GW in a four way tie for 22nd. While BU is in a 2 way tie for 26th. So an unregulated for profit magazine, that is unable to determine, which schools are 23,24,25th best is the one reason for paying more money, getting away from your support system, and moving away from a City you enjoy. (Bad Choice)
It is also worth noting that OP's post went up in 2013 when Boston was 29th, but has risen to 26th. GW was 20th in 2013, but has fallen to 22nd and if BU is ahead of GW when OP graduates in 2016, nobody will be shocked.
Fordham also went from 29th to plummeting 38th. http://www.top-law-schools.com/rankings.html
What happened at these schools during that time? Nothing of consequence they are all fine, which is why you use common sense and not a for profit unregulated magazine to make a life altering decision.
Therefore, when faced with the choice of paying less to live in a City you enjoy and have the support of friends and family, compared to paying more, to move to a City you enjoy less away your support system, you choose the former.
It is this amazing tool called common, which far to many 0L's myself included as 0L fail to use when choosing a law school.