B) pay all the remaining rent but I’ll credit it against the kid’s rent next year.

Buying site unseen is a huge risk unless the buyer and wholesaler have a history doing deals together.My buyers trust the deals that I bring them, but I also provide them with in-depth inspection reports along with photos/videos of the inspection along with multiple cost to completes through multiple contractors.

@Helena Goyvaerts rate for a 30-year fix would be at least 8.5% with some points (1% of loan amount).Most DSR lenders have a minimum credit score requirement from the applicant.

The Heloc can also pose as a debt obstacle since its an open end mortgage a.k.a credit card.a mortgage is also set up over 30 years so it offers a lower rate and payment. 

I used a personal line of credit of $8k to invest.

Some will be ok in 2nd position and some will not and force you to refinance out the first - but those are options that are probably cheaper than credit cards 

Alternatively, if the bank ( assuming there is a bank) is fine with it, you could negotiate a credit and escrow the funds to be released after you do it yourself.  

For a $300,000 property it could be $30,000.Then, do you have that much cash or credit available to you, in the event of a Due on Sale call?

There have been other times in our countries history where we needed more population.... i.e. the Irish immigration.

(Available time, money, income, family situation, credit availability, time horizon, real estate market location and phase, medical situation, etc etc.)