Get them on your side- explain the process and proof needed to get rid of the other tenants, and make them see that it isn't going to happen quickly.Most likely, the upstairs people need to put their adulting pants on and grow up.

She sent us a message that she is moving her adult daughter and grandson (age 12) into her unit, “for over a month,” until they find a place to stay.   

I have each adult applicant over 18 fill out an application and I do a background/credit check on each of them.

I grew up around people who had wealth- the inferiority I felt was crippling and could have been quite debilitating in adult hood, but for some chance decisions.

He does normal STRs but also rents them out by the day for filming sets for the adult film industry. 

The parents had passed and left this house to their adult children who could not agree on what should be done.

-Should I tenant screen for all adults in the house or only those responsible for paying the lease as agreed?

Hi Brett,As an additional line of attack, you might want to make sure to attend as many real estate meetups in your area as you can.If you want to be taken seriously, dress respectfully for the adults that attend so you will be respected by them, but don't over do it.

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These moms see it as their right to move their adult criminal sons in, who we are appropriately terrified of.