That will be your biggest challenge as an investor. 

A challenge with this loans is you're often sandwiched between a balloon and a pre-payment penalty. 

Also ask how many living and pre-deceased children they have. 

Marc,  Our lease states we cans show the property during the notice interval, and access by the landlord is authorized for showings and inspections.The first step is to visit the property to "preview" it for the marketing, and you can note any big issues that may delay occupancy, and even stress to the residents what they could be docked for.I always tell the residents to protect their valuables because its hard to track other people's children during showings, and the more they cooperate and the faster the house leases, the less time they have to tolerate showings.I've had perfect houses occupied the next day.I've had disasters that need  six weeks to prepare.With this effort and a mid-lease maintenance inspection, there are fewer surprises.

He is unlikely to challenge you in court because that would be admitting to something illegal.

I will buy each of the children a drum kit when they move in". 

(And would this be more challenging for the courts?) 

Would you trust someone more that is watching your kids with a person that has children?

Been in this rollercoaster ride for about 11yrs, Love the challenge from negotiating with lenders (shortsales) To dealing with multiple sellers with different mindsets. 

If you are looking to buy something off of the local MLS - you might find that is going to be a challenge.