I've had qualified renters move into a rental, add their bum friends or family members, and then disappear, leaving me with bad renters who weren't approved and aren't on the lease.The best practice is to screen every adult, approve them, and add them to the lease. 

It has nothing to do with marital status or one's relationship with other adults.

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Every adult should be fully screened to ensure you aren't renting to a violent criminal, drug dealer, etc.

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@Tyler Condon I manage a few properties in the greater Phoenix, AZ area that are adult 55 plus and have great success with them.

In my experience, a large percentage of them are fully functional adults that refuse to take personal responsibility for their lives, which is why they are receiving free rent from taxpayers instead of working for a living.

I am a little late to the game and have been told several times throughout my adult life to invest in real estate, but I ignored the advice.

My friend and her adult son have lived in a SFH together for about 20 years. 

We have adult kids.