I had a tenant me ask if an another adult who will be living with her and her two children needs to be on the lease.

This tenant has had an unauthorized adult living in the unit (using water I pay for) in addition to failure to pay rent.

I just rented out a home to a family of 4. The unit has a sort of basement apartment, but it’s all one unit and can’t be rented as a second unit, but the whole house has legal occupancy limit of 8. Upon signing lease ...

I ran a screening on all of the adults including the brother.  

In every letter we point out that there was a complaint reported by a fellow and that we are not accusing anyone in particular of doing anything but that we urge them to call the police if illegal activity is going on in the building.If the problem persists AND now there are police records confirming the illegal activity then you can go to the tenant and have a discussion.We really strongly urge tenants to try and work out things between themselves as adults and us being involved should be a last resort after they try to work it out themselves and/or the cops are called.

@Bruce Kozak I do not do this personally, but know someone who charges a fee of $12.50 per adult for water, with a provision in the lease that says any leaks reasonably observable by the tenant must be reported within 1 day or there will be a charge for the additional water use from that month's bill.

Twenty-four hours is presumed to be a reasonable notice in the absence of evidence to the contrary.(9) Promptly commence an action under Chapter 1923. of the Revised Code, after complying with division (C) of section 5321.17 of the Revised Code, to remove a tenant from particular residential premises, if the tenant fails to vacate the premises within three days after the giving of the notice required by that division and if the landlord has actual knowledge of or has reasonable cause to believe that the tenant, any person in the tenant's household, or any person on the premises with the consent of the tenant previously has or presently is engaged in a violation as described in division (A)(6)(a)(i) of section 1923.02 of the Revised Code, whether or not the tenant or other person has been charged with, has pleaded guilty to or been convicted of, or has been determined to be a delinquent child for an act that, if committed by an adult, would be a violation as described in that division.

They don't want to live with me or vice versa - time to go.For Each 2 adults - 1 full bath.Considering the same model but me not living there.  

In one of my SFR rentals a family of three adults got together to share the rent, and still were late paying it every other month. 

So long as you don't persoanlly benefit from your child's IRA, you could certainly have it self -directed and would think you could make the investment choices for an under aged child (non-legal adult) Again, consult with an attorney.