You really need to find yourselves an accountant and attorney with cross-border real-estate experience and find the organisational structure which best meets your needs.Where you will be five individuals, entering this venture, @Matthew Lee is correct about doing a level set with everyone, before monies are committed.  

Saw these while exploring around Newark yesterday in the bordering neighborhood in Harrison NJ (East Newark).

Better yet look closer to MA border.

The house has serious back debt to the city & back taxes, but there's room for me to flip it, if I can get them on board.There is BAD blood between the 4 of them, and I'll need them to sign a contract selling it to me, after we get their names on the deed (it's still in the deceased relatives name).  

If not, there are probably tax liens on the property.Hopefully the owner is not deceased inside.

As you will need to pick up off-market deals to sell to the local market investors.Make sure you get to know your market well as serious investors will rip your property apart if your numbers don't make sense or if you are just trying to wholesale a property that is either on the MLS or being advertised at a lower purchase price on another website/wholesalerTalk to a cross border tax account before setting anything up on the entity side as this will be important.

For example, the Hillsboro schools have for years been considered among the worst in the state (they're improving), and Hillsboro borders the Contoocook Valley and John Stark districts, which are excellent.NH also has few traditional neighborhoods in its smaller towns.  

I generally do business from Waterbury to Stoors (UCONN) from west to east, from the CT/MA border to New Haven on I-91 and the entire route 9 cooridor.What kind of deal is it? 

This person is selling her deceased mothers house and doesn't want to deal with realtors.

How do you go about reaching out to the kids of the deceased to take this burden off their hands?