On the other hand, most parents would balk about putting their non-paying college children or 18 year old son who is in hs.

I've had way more damage from children than dogs.

If he was it's amazing the school hasn't fallen down.They were nice people but they had almost adult children who seemed to pop out babies like they were PEZ dispensers, then drop them off at mom and dads to raise. 

In most cases this will prevent clogs.That said, some children can have very large bm's to the point where they wont flush and may require something to break them up.This would definitely be a tenant issue and not the landlord.

I am actually trying to do a couple of things: build retirement savings hence wanting to put a "little extra" into the SD401k (which may not be possible), build/operate a real estate business, pay down personal debts, and have an alternate way of funding college for my children.

I have a wife and 6 children.

I have both of these, and when an SFR flooded this year and deprived one of the tenant children of a room for a couple of weeks I issued them a rent rebate.

I teach my teenage children how to buy real estate and do repairs as needed.

We also have two Millennial children who will, knock wood, be out of college and finding their own way in a year.

I wouldn't let fear of drowning keep me from teaching my children to swim, but that doesn't mean that I'm going to throw them into the ocean without floatees so that they can teach themselves.