Average maintenance costs are 10% of annual income, so deduct another $2,000 (older houses with teenage Tenants will cost more).

Maybe one of the triplex units has 2 full bathrooms and the current SFR has 1.5, but one of the kids is now a teenager and needs her/his bathroom time so they can apply 5 lbs of hairspray (or whatever it is teenagers do these days).

Let me start off by saying that I've been researching real estate investing since I was a teenager and pursued construction to learn how to renovate the houses myself.

I see teenagers hanging on the porches of the abandoned houses.

I did have one complaint , wife stayed home with 2 lazy teenagers .

This also applies when a family has a teenager about to turn legal age, add them to the agreement within a reasonable time.

I wish I could house hack but I have a family and I think they would kill me especially my teenager who loves her own space.

Talk to any teenager or 20 something.  99% of them have absolutely no interest in framing a house, plumbing a house or wiring a house.  

My children are teenagers. 

Seems odd when you have teenage children.