I reside in a good school district in a peaceful neighborhood.

Having a good sanitation system, and a city that cares about having a clean environment would be a great start.Unfortunately, after contacting the city and local groups that claim to want to make the city a beautiful place do not want to help put up a public trashcan.My last resource is contacting SEPTA and asking them.

I would like to buy a property which has an existing section 8 family tenants, for the only reason that I own and rent the adjacent property to a quiet retired couple who cannot enjoy peacefully their home because of these people.

Does HELOC and other home equity financing methods work in the current high interest rate environment?

Given the rate environment I'm not sure that a HELOC makes much sense or if you'll get something significant enough to buy something closer to Boston.

But using that money as a downpayment is not "correct".For starters, it's almost guaranteed in this environment that the interest rate on your HELOC is higher than your CoC returns on the properties you'd buy.That doesn't make sense.Beyond that, how will you pay off the $400k HELOC balance?

Neither scenario is a suitable environment for investment. 

In this environment how are people doing the deals?

Either way, I recommend finding peace with what you can't control (whether that is eviction or them living in the mobile home); otherwise, you let the siblings keep winning if they impact your happiness.

They said it is a new loan product being offered in todays environment.