When MLS was created in most areas across the country, NAR became a virtual monopoly in residential real estate sales controlling 89% of the market.  

Do you have any control over what the existing owner can do to the property?

If you can buy within a 2 hour drive (maybe Sacramento area, which is what I'm considering), you have a lot more control as far as checking on the property than buying OOS. 

If you can't keep control of your personal finances, you are highly unlikely to succeed in real estate investing.

Pay it off with a commercial DSCR refinance loan once you've gotten the rents up to an amount that will allow you to cash out on your HELOC.I like using my HELOC but only in short-term scenarios because it's a floating rate and I can't control when or how the bank will make adjustments to the payback variables. 

Because I don't control the process.

Also you may want to consider Checkbook IRA (aka IRA owned LLC), which will enable you to bypass the custodian and have checkbook control over your retirement funds.

I wouldn't look at fix and flip for 100+ year old properties I'd recommend urban infill new construction much more control less stressful more advanced more value easier exit, etc etc 

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.

i iknow of a couple investors who are members of those sites. i thought about it, but didn't when they couldn't tell me how many leads came in per month on avg.i like being in control of my own marketing and once u have it going consistently the phone will ring. the other leads are icing on the cake