This has been a true win-win situation.

Make a plan and work the plan, persistence and consistency will win the day.

I can only speak for Texas but here the only eviction you can count on winning is one where you can prove non-payment of rent.

A life where I can help those in need (sellers) with win-win situations.

the saying goes, "the leopard doesn't change his spots"....so I tend to agree with the board, and my only caveat is that you really want to know will he pay the rent...I have had a few very good long term tenants who made rent a priority but still had the errant medical bill or consumer credit problem..so I would really probe every landlord and the rental history, but recency and amount of payment  issues tends to indicate that if he won't pay others, he probably won't pay you..a vacancy may be better..with an empty unit, remember an ideal tenant could call anytime..you may have to cover the mortgage another month, but you also cover it if he doesn't pay, plus evict, and re-prep the unit....vacancy wins unanimous decision...

Even though sometimes you feel you are right, consider "losing to win".

@Steve Vaughan I think this is a win- win,  he gets  to keep mom happy  and I should have mentioned the duplex needs about 18-20K to get the 115K .  

The marketers who do will win the game.

Use that to your advantage.I know I am being fairly vague with my answers but that's because you need to approach these sellers with multiple strategies to create a win-win scenario.  

I am sure your client has no intention of doing this.But I have seen these scenerios were this has happened and this is just not about how great it is for you and your student.. both sides must win.