But, I want to address your comparison to BiggerPockets.

The response might be, 'One check with both names,' or, 'Two checks split 50/50, mailed to separate addresses' or something similar. 

I created an LLC, and the rental address is not the name of the LLC.

Since the son clearly indicated he intended to live there, it's important to address this upfront.

When I was growing my first real estate portfolio of small MF properties, I kept a list of non-pressing items that needed to be addressed at the properties.

The "settlement" an imperfect solution didn't address the quest by the market and buyers to pay and finance LESS!!!   

You can generally place a voucher tenant in any property.In order to place a section 8 tenant you will have to pass an initial inspection as well as an annual inspection where they tend to be more strict and have you fix things that you may not have addressed for a market tenant.

I've spoke with the folks over at Abodea, who do offer a scalable call-center approach to HOA PM at quite affordable rates, but we're still missing the kind of local, on-site general contractor/handyman or capital management planning schedules that would be required for proactively addressing homeowner and community association needs. 

how do you guys go about separating your residential address from getting mail from tax etc from your investment property?

Consider all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.